Fixed bug #637

Switched right click emulation to be Ctrl-click, which matches Mac OS X

--HG--
branch : SDL-1.2
extra : convert_revision : svn%3Ac70aab31-4412-0410-b14c-859654838e24/branches/SDL-1.2%403868

src/video/quartz/SDL_QuartzEvents.m

@@ -785,7 +785,7 @@ void QZ_PumpEvents (_THIS)
                     if ( SDL_getenv("SDL_HAS3BUTTONMOUSE") ) {
                         DO_MOUSE_DOWN (SDL_BUTTON_LEFT);
                     } else {
-                        if ( NSCommandKeyMask & current_mods ) {
+                        if ( NSControlKeyMask & current_mods ) {
                             last_virtual_button = SDL_BUTTON_RIGHT;
                             DO_MOUSE_DOWN (SDL_BUTTON_RIGHT);
                         }