This makes us link directly to getaddrinfo if it is available, making
binaries incompatible with anything prior to windows XP. If compatibility
is desired, compile with --target-os=mingw32-prexp.

Patch by Martin Storsjö <martin at martin dot st>.


git-svn-id: file:///var/local/repositories/ffmpeg/trunk@21442 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b