Log Message:
Apply MacPorts patch-libuv-legacy.diff for pre-10.7 platforms, and
MacPorts patch-libuv-unix-core-close-nocancel.diff for:
- older gcc versions to not error on pragmas
- 32bit code to link correctly
- Tiger to work around not having a non-cancellable close function

Fixes build on Snow Leopard. For other platforms, NFCI.