This triggered an issue in cabal, which doesn't correctly escape the
path passed to --with-gcc, causing network to fail to build on Windows
where the path to gcc might contain a space (e.g. "Program Files").
This reverts commit d708058.
There's an OS X bug where passing AI_NUMERICSERV without a port number
causes the getaddrinfo syscall to segfault (which it shouldn't).
This commit was recreated from the 188.8.131.52 release, which commits were
somehow lost (i.e. not pushed to GitHub).