- Updated Zlib definitions to version 1.2.3. The only difference is that

- Updated Zlib definitions to version 1.2.3. The only difference is that
the function calling convention has changed on Win32 (previously, the
zlib DLL used WINAPI). YOU NOW NEED AN OFFICIAL "zlib1.dll" version
1.2.x instead of your old "zlib.dll" (get it from http://www.zlib.net/).
If you still want to use a DLL with the old calling convention,
uncomment line 101 and recompile (such a DLL can be found at
http://www.winimage.com/zLibDll/).
- Removed QuakeForge copyright since the last bit of QF
code was removed months ago by LordHavoc
- Changed the way we test the presence of the O_NONBLOCK flag

git-svn-id: svn://svn.icculus.org/twilight/trunk/darkplaces@5716 d7cf8633-e32d-0410-b094-e92efae38249