Revert "configure: fix cross-compilation host_arch_cc()"

Several people have reported cross-compiling build breakage, see e.g.
https://groups.google.com/forum/#!topic/nodejs/k8HzqpqPkJQ

Message-Id: <823c3bd1-e104-4409-86ad-0ab6de936fec@googlegroups.com>
Subject: [nodejs] nodejs 0.10.12 and Angstrom issues

This reverts commit acbdabb74b1b8484671fd3c44cd9eb9a7ea11f41.
doc: tls: ECDH ciphers are not supported
blog: v0.11.3 release
buffer: add comment explaining buffer alignment

Avoids alignment issues (unaligned loads/stores) on ARM. Originally
added in commit 285d8c6.

Fixes #3030.
doc: vm: update github issues link
zlib: allow zero values for level and strategy
zlib: level can be negative
zlib: remove unused parameter
zlib: allow custom flush type for flush()
zlib: allow changing of level and strategy
zlib: allow zero values for level and strategy

This is a back-port of commit c9644fb from the master branch.
zlib: level can be negative

This is a back-port of commit e945903 from the master branch.
test: fix tls-hello-parser-failure on smartos

Assert that when the client closes it has seen an error, this prevents
the test from timing out.

Also queue a second write in the case that we were able to send the
buffer before the other side closed the connection.
http: use an unref'd timer to fix delay in exit

There was previously up to a second exit delay when exiting node
right after an http request/response, due to the utcDate() function
doing a setTimeout to update the cached date/time.

Fixing this should increase the performance of our http tests.
test: fix tls-hello-parser-failure on smartos

Assert that when the client closes it has seen an error, this prevents
the test from timing out.

Also queue a second write in the case that we were able to send the
buffer before the other side closed the connection.
tls: export TLSSocket
crypto: fix memory leak in LoadPKCS12

X509_STORE_add_cert increment reference of passed `x509` cert,
`X509_free` must be called to avoid memory leak.
slab_allocator: remove SlabAllocator

Now that Buffer instantiation has improved, the SlabAllocator is an
unnecessary layer of complexity preventing further performance
optimizations.

Currently there is a small performance loss with very small stream
requests, but this will soon be addressed.
smalloc: use malloc instead of new

To use realloc the implementation had to be changed to use malloc/free.
{stream,udp,tls}_wrap: remove unused offset/length

The function arguments offset and length are now no longer used since
all I/O requests now use discretely allocated memory.