Just skip GL function calls if we don't have function pointers
Just skip GL function calls if we don't have function pointers

* This is completely invalid but better than crashing. This can happen as a
  race-condition if the user injects into a running program that's already using
  GL on one thread, before we've completed installing our hooks.

googlestadia/renderdoc,baldurk/renderdoc,Zorro666/renderdoc,googlestadia/renderdoc,googlestadia/renderdoc,TurtleRockStudios/renderdoc_public,baldurk/renderdoc,googlestadia/renderdoc,Zorro666/renderdoc,baldurk/renderdoc,TurtleRockStudios/renderdoc_public,Zorro666/renderdoc,baldurk/renderdoc,googlestadia/renderdoc,baldurk/renderdoc,TurtleRockStudios/renderdoc_public,googlestadia/renderdoc,baldurk/renderdoc,TurtleRockStudios/renderdoc_public,TurtleRockStudios/renderdoc_public,Zorro666/renderdoc,TurtleRockStudios/renderdoc_public,Zorro666/renderdoc,Zorro666/renderdoc