This reverts commit
136a12ac98868d82c2ae9fcc80d11044a7ec56d1.
According to belak51 on IRC, this commit broke Allegro, which would no
longer compile. Applications apparently expect the GLXContextID typedef
to exist in glx.h; removing it breaks them. A bit of searching around
the internet revealed other complaints since upgrading to Mesa 10.
Cc: "10.0" <mesa-stable@lists.freedesktop.org>
/* GLX 1.3 and later */
typedef struct __GLXFBConfigRec *GLXFBConfig;
typedef XID GLXFBConfigID;
+typedef XID GLXContextID;
typedef XID GLXWindow;
typedef XID GLXPbuffer;