improve glNormal3f behavior
improve glNormal3f behavior

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