build: remove workarounds for gcc <= 4.4
build: remove workarounds for gcc <= 4.4

Now that V8 requires a compiler with decent C++11 support, there is no
reason to keep supporting old versions of gcc.  Remove workarounds for
bugs in gcc 4.4 and older.

This coincidentally makes it easier to build with clang 3.3 + address
sanitizer because clang no longer chokes on the `-fno-tree-vrp` switch.

PR-URL: https://github.com/node-forward/node/pull/24
Reviewed-By: Fedor Indutny <e39d94bae70283f13d24c278e04952d6dad9384b@indutny.com>

dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node