always return glX stub for unknown functions
always return glX stub for unknown functions

seandepagnier/glshim,seandepagnier/glshim,lunixbochs/glshim,RobertoMalatesta/glshim,RobertoMalatesta/glshim,lunixbochs/glshim,lunixbochs/glshim,lunixbochs/glshim,RobertoMalatesta/glshim,RobertoMalatesta/glshim,seandepagnier/glshim,seandepagnier/glshim