winex11.drv: don't include GL/gl.h

[Austin English]

No longer needed after Roderick's and AJ's changes to the opengl code.
Tested on OS X and Ubuntu 8.10.

-- 
-Austin
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diff --git a/dlls/winex11.drv/opengl.c b/dlls/winex11.drv/opengl.c
index f207a32..cb5de48 100644
--- a/dlls/winex11.drv/opengl.c
+++ b/dlls/winex11.drv/opengl.c
@@ -42,9 +42,6 @@ WINE_DEFAULT_DEBUG_CHANNEL(wgl);
 #undef CALLBACK
 #undef WINAPI
 
-#ifdef HAVE_GL_GL_H
-# include <GL/gl.h>
-#endif
 #ifdef HAVE_GL_GLX_H
 # include <GL/glx.h>
 #endif