ws2_32: getaddrinfo(NULL, "", ...) on OS X.

[David Nadlinger]

If getaddrinfo() is passed a null host and an empty port string, it 
still resolves to 127.0.0.1/0.0.0.0 on Windows and Linux, but fails on 
OS X. The added workaround (rewriting the port to "0") works on both 
Linux and OS X.

Tested on OS X 10.7.2, Arch Linux (Kernel 3.1.4, glibc 2.14.1) and 
Ubuntu Oneric, and verified against Windows Server 2008 R2.

See http://klickverbot.at/p/getaddrinfo for a detailed comparison of the 
edge case behavior on the different OSes.
---
  dlls/ws2_32/socket.c     |    9 +++++++--
  dlls/ws2_32/tests/sock.c |    6 ++++++
  2 files changed, 13 insertions(+), 2 deletions(-)


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