Fix a bug in glm::perspective() where a degrees-to-radians conversion is being performed twice.
Fix a bug in glm::perspective() where a degrees-to-radians conversion is being performed twice.

ramassin/glm,novaquark/glm,rleigh-dundee/glm,hrehfeld/glm,ramassin/glm,nikodil/glm,novaquark/glm,nikodil/glm,dustin-biser/glm,rleigh-dundee/glm,dustin-biser/glm,hrehfeld/glm