Don't conflict with glext.h if it's already been included
Don't conflict with glext.h if it's already been included

cebash/SDL_PSL1GHT,aduros/SDL,aduros/SDL,cebash/SDL_PSL1GHT,aduros/SDL,aduros/SDL,aduros/SDL,cebash/SDL_PSL1GHT,cebash/SDL_PSL1GHT,cebash/SDL_PSL1GHT