Load OpenGL ES 2.0 function procs

Load functions procs supported by OpenGL ES 2.0, though there is not a
compatible renderer yet. Change argument for GLimp_Init from coreContext
to fixedFunction.

code/renderercommon/tr_common.h

@@ -155,7 +155,7 @@ IMPLEMENTATION SPECIFIC FUNCTIONS
 ====================================================================
 */
 
-void		GLimp_Init( qboolean );
+void		GLimp_Init( qboolean fixedFunction );
 void		GLimp_Shutdown( void );
 void		GLimp_EndFrame( void );