Fixed bug #1000
Fixed bug #1000

Don't crash if someone tries to delete a context after we've unloaded the library.  In this case it's SDL_compat that doesn't know SDL_VideoQuit() has been called.  Hmm...

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