fix gc-bench
update aio module - libuv 0.11.14

update to latest 0.11.14 API
- merge *6 functions
- removed aio_last_error
- consting and buf ptrs
mingw32 fixes for aio and buffile, abs paths

improve the Makefiles a bit (from potion)
more mingw32 fixes for aio and buffile

f*lockfile are not defined on mingw
aio needs -lpthread -lws2_32 -lpsapi
x86_64-w64-mingw32 and cygwin64 both fail

but set the PAGESIZE=65536
Note that cygwin64 native creates ARGDIR=2, but it us unused thanksfully
fix make usage: seperate perl11/p2 remote