Fix compilation failure: './ wavy_kernel_kqueue.h' file not found

Hi Furuhashi-kun,

The original error is like below. Please pull this request for successful brew installation. Thanks!

```sh
% brew install mpio
==> Downloading https://github.com/downloads/frsyuki/mpio/mpio-0.3.7.tar.gz
Already downloaded: /Library/Caches/Homebrew/mpio-0.3.7.tar.gz
==> ./configure --prefix=/usr/local/Cellar/mpio/0.3.7
==> make install
Making install in mp
make[2]: Nothing to be done for `install-exec-am'.
test -z "/usr/local/Cellar/mpio/0.3.7/include/mp" || ../ac/install-sh -c -d "/usr/local/Cellar/mpio/0.3.7/include/mp"
 /usr/bin/install -c -m 644 endian.h exception.h functional.h iocntl.h memory.h object_callback.h object_delete.h pthread.h shared_buffer.h signal.h sparse_array.h stream_buffer.h sync.h tls_set.h unordered.h unordered_map.h unordered_set.h utilize.h wavy.h '/usr/local/Cellar/mpio/0.3.7/include/mp'
Making install in mpsrc
/bin/sh ../libtool  --tag=CXX   --mode=compile /usr/bin/clang++ -DHAVE_CONFIG_H -I. -I..  -I.. -isystem /usr/local/include  -O4 -Wall -Os -w -pipe -march=native -Qunused-arguments -mmacosx-version-min=10.7 -g -c -o libmpio_la-wavy_connect.lo `test -f 'wavy_connect.cc' || echo './'`wavy_connect.cc
/bin/sh ../libtool  --tag=CXX   --mode=compile /usr/bin/clang++ -DHAVE_CONFIG_H -I. -I..  -I.. -isystem /usr/local/include  -O4 -Wall -Os -w -pipe -march=native -Qunused-arguments -mmacosx-version-min=10.7 -g -c -o libmpio_la-wavy_listen.lo `test -f 'wavy_listen.cc' || echo './'`wavy_listen.cc
/bin/sh ../libtool  --tag=CXX   --mode=compile /usr/bin/clang++ -DHAVE_CONFIG_H -I. -I..  -I.. -isystem /usr/local/include  -O4 -Wall -Os -w -pipe -march=native -Qunused-arguments -mmacosx-version-min=10.7 -g -c -o libmpio_la-wavy_loop.lo `test -f 'wavy_loop.cc' || echo './'`wavy_loop.cc
/bin/sh ../libtool  --tag=CXX   --mode=compile /usr/bin/clang++ -DHAVE_CONFIG_H -I. -I..  -I.. -isystem /usr/local/include  -O4 -Wall -Os -w -pipe -march=native -Qunused-arguments -mmacosx-version-min=10.7 -g -c -o libmpio_la-wavy_signal.lo `test -f 'wavy_signal.cc' || echo './'`wavy_signal.cc
libtool: compile:  /usr/bin/clang++ -DHAVE_CONFIG_H -I. -I.. -I.. -isystem /usr/local/include -O4 -Wall -Os -w -pipe -march=native -Qunused-arguments -mmacosx-version-min=10.7 -g -c wavy_listen.cc  -fno-common -DPIC -o .libs/libmpio_la-wavy_listen.o
libtool: compile:  /usr/bin/clang++ -DHAVE_CONFIG_H -I. -I.. -I.. -isystem /usr/local/include -O4 -Wall -Os -w -pipe -march=native -Qunused-arguments -mmacosx-version-min=10.7 -g -c wavy_connect.cc  -fno-common -DPIC -o .libs/libmpio_la-wavy_connect.o
libtool: compile:  /usr/bin/clang++ -DHAVE_CONFIG_H -I. -I.. -I.. -isystem /usr/local/include -O4 -Wall -Os -w -pipe -march=native -Qunused-arguments -mmacosx-version-min=10.7 -g -c wavy_loop.cc  -fno-common -DPIC -o .libs/libmpio_la-wavy_loop.o
libtool: compile:  /usr/bin/clang++ -DHAVE_CONFIG_H -I. -I.. -I.. -isystem /usr/local/include -O4 -Wall -Os -w -pipe -march=native -Qunused-arguments -mmacosx-version-min=10.7 -g -c wavy_signal.cc  -fno-common -DPIC -o .libs/libmpio_la-wavy_signal.o
In file included from wavy_signal.cc:19:
In file included from ./wavy_signal.h:In file included from wavy_connect.cc22::
In file included from In file included from wavy_loop.cc18:
:In file included from 18:
./wavy_loop.hIn file included from :./wavy_loop.h:23./wavy_loop.h:
23./wavy_kernel.h:
::50:10: fatal error: './ wavy_kernel_kqueue.h' file not found
./wavy_kernel.h23::
./wavy_kernel.h50:10: fatal error: './ wavy_kernel_kqueue.h' file not found
#include MP_WAVY_KERNEL_HEADER(MP_WAVY_KERNEL)
         ^
./wavy_kernel.h:44:#include MP_WAVY_KERNEL_HEADER(MP_WAVY_KERNEL)
         ^:50
:10: fatal error: './ wavy_kernel_kqueue.h' file not found
2./wavy_kernel.h:44: note: expanded from macro 'MP_WAVY_KERNEL_HEADER'
#include MP_WAVY_KERNEL_HEADER(MP_WAVY_KERNEL)
         ^
:        MP_PP_HEADER(., wavy_kernel_, sys, )./wavy_kernel.h
:        ^44
:2./pp.h::9: 3note: :expanded from macro 'MP_WAVY_KERNEL_HEADER'
2note: expanded from macro 'MP_PP_HEADER'
:                MP_PP_XSTR( MP_PP_XCONCAT(dir/prefix ## file, suffix).h )        MP_PP_HEADER(., wavy_kernel_, sys, )

                ^
         ^note: expanded from macro 'MP_WAVY_KERNEL_HEADER'
./pp.h:5:23: note: expanded from macro 'MP_PP_XSTR'
#define MP_PP_XSTR(s) MP_PP_STR(s)
                      ^
        MP_PP_HEADER(., wavy_kernel_, sys, )
        ^./pp.h:4:

22: note: ./pp.hexpanded from macro 'MP_PP_STR':9:./pp.h
:9:3:3:  note: #define MP_PP_STR(s) #sexpanded from macro 'MP_PP_HEADER'
note: expanded from macro 'MP_PP_HEADER'
                MP_PP_XSTR( MP_PP_XCONCAT(dir/prefix ## file, suffix).h )
                ^
                MP_PP_XSTR( MP_PP_XCONCAT(dir/prefix ## file, suffix).h )
                ^
./pp.h:5:
                     ^./pp.h23: note:
expanded from macro 'MP_PP_XSTR'
#define MP_PP_XSTR(s) MP_PP_STR(s)
                      ^
./pp.h:4:22: note: expanded from macro 'MP_PP_STR'<scratch space>
:49:1: note: #define MP_PP_STR(s) #s
expanded from macro '#'
                     ^"./ wavy_kernel_kqueue.h"

^
:5:23: note: expanded from macro 'MP_PP_XSTR'
#define MP_PP_XSTR(s) MP_PP_STR(s)<scratch space>
                      ^
:./pp.h:494:1: note: expanded from macro '#':22:
 "./ wavy_kernel_kqueue.h"note: expanded from macro 'MP_PP_STR'
#define MP_PP_STR(s) #s

                     ^
^
<scratch space>:49:1: note: expanded from macro '#'
"./ wavy_kernel_kqueue.h"
^
In file included from wavy_listen.cc:18:
In file included from ./wavy_loop.h:23:
./wavy_kernel.h:50:10: fatal error: './ wavy_kernel_kqueue.h' file not found
#include MP_WAVY_KERNEL_HEADER(MP_WAVY_KERNEL)
         ^
./wavy_kernel.h:44:2: note: expanded from macro 'MP_WAVY_KERNEL_HEADER'
        MP_PP_HEADER(., wavy_kernel_, sys, )
        ^
./pp.h:9:3: note: expanded from macro 'MP_PP_HEADER'
                MP_PP_XSTR( MP_PP_XCONCAT(dir/prefix ## file, suffix).h )
                ^
./pp.h:5:23: note: expanded from macro 'MP_PP_XSTR'
#define MP_PP_XSTR(s) MP_PP_STR(s)
                      ^
./pp.h:4:22: note: expanded from macro 'MP_PP_STR'
#define MP_PP_STR(s) #s
                     ^
<scratch space>:49:1: note: expanded from macro '#'
"./ wavy_kernel_kqueue.h"
^
1 error generated.
make[1]: *** [libmpio_la-wavy_listen.lo] Error 1
make[1]: *** Waiting for unfinished jobs....
1 error generated.
1 error generated.
1 error generated.
make[1]: *** [libmpio_la-wavy_signal.lo] Error 1
make[1]: *** [libmpio_la-wavy_connect.lo] Error 1
make[1]: *** [libmpio_la-wavy_loop.lo] Error 1
make: *** [install-recursive] Error 1
config.log was copied to /Users/aikawa/Library/Logs/Homebrew
==> Build Environment
HOMEBREW_VERSION: 0.9.2
HEAD: 29b2eb06fc9e316f708723c87a510b6152860274
CPU: quad-core 64-bit sandybridge
OS X: 10.7.4-x86_64
Xcode: 4.3.3
CLT: 4.3.0.0.1.1249367152
X11: 2.6.4 @ /usr/X11
CC: /usr/bin/clang
CXX: /usr/bin/clang++ => /usr/bin/clang
LD: /usr/bin/clang
CFLAGS: -Os -w -pipe -march=native -Qunused-arguments -mmacosx-version-min=10.7
CXXFLAGS: -Os -w -pipe -march=native -Qunused-arguments -mmacosx-version-min=10.7
CPPFLAGS: -isystem /usr/local/include
LDFLAGS: -L/usr/local/lib
MACOSX_DEPLOYMENT_TARGET: 10.7
MAKEFLAGS: -j4
Error: Failed executing: make install (mpio.rb:10)
If `brew doctor` does not, this may help you fix or report the issue:
    https://github.com/mxcl/homebrew/wiki/bug-fixing-checklist
```

Naoyoshi Aikawa / awakia