[PATCH proto/x11proto] Adjust <windows.h> wrapping to work with MinGW-w64 headers as well

[Colin Harrison]

Hi,

http://lists.x.org/archives/xorg-devel/2012-October/034096.html

works for me (MinGW 32-bit) for both Xwinsock.h and Xwindows.h

Reviewed-by:  Colin Harrison <colin.harrison at virgin.net>

Thanks,
Colin Harrison