[Patch] hw/xwin: remove glx subdirectory.

[Colin Harrison]

Hi,

Any new hw/xwin/glx code (thanks John Turney) does not need to include the
glcore.h file.
So best go ahead and sync up the gl headers and glapi/indirect code anyway
between Mesa, glproto and xserver/glx.
AFAICS should not be a problem for the xwin ddx.

Thanks,
Colin harrison