Made display_win32_alert take a const char pointer, since that's what it's always called with.
Include playsave.h (which includes winsock2.h) before internal.h (which includes windows.h) so that winsock2.h is included before windows.h. This suppresses a compiler warning under mingw32.
Include winsock2.h before windows.h. This suppresses a compiler warning under mingw32.
Move ogl_init.h (which includes windows.h) to the bottom so winsock2.h gets included before windows.h. This suppresses a compiler warning under mingw32.
Move the windows.h include to the bottom so winsock2.h gets included before windows.h. This suppresses a compiler warning under mingw32.
Merge pull request #7 from spudlyo/fix-compiler-warnings

Fix compiler warnings for mingw32.