mplayer stopped compiling for windows

I tried to compile a GUI version of mplayer for Windows after a long 
hiatus. I ran into 2 problems.

I found a compilation error in libvo/gl* because XVisualInfo was not 
defined.  Attached is a patch to fix it.

I also had a problem with ffmpeg/libavformat/udp.c.  I found a report on 
the ffmpeg mailing and a solution.  _WIN32_WINNT has to be at least 
0600.  Windows XP is not supported by ffmpeg. I added a definition to my 
config script in "extra-cflags".  Maybe the configure script should be 
enhanced.

With these two changes I successfully compiled mplayer on Windows.

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Index: libvo/gl_common.h
===================================================================
--- libvo/gl_common.h	(revision 38175)
+++ libvo/gl_common.h	(working copy)
@@ -316,6 +316,7 @@
 extern void* (GLAPIENTRY *mpglAllocateMemoryMESA)(void *, int, size_t, float, float, float);
 extern void (GLAPIENTRY *mpglFreeMemoryMESA)(void *, int, void *);
 
+#ifdef CONFIG_GL_X11
 extern XVisualInfo *gl_vinfo;
-
+#endif
 #endif /* MPLAYER_GL_COMMON_H */