Adds controllermap utility to test suite.

test/testgamecontroller.c

@@ -225,6 +225,8 @@ main(int argc, char *argv[])
         SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't initialize SDL: %s\n", SDL_GetError());
         return 1;
     }
+    
+    SDL_GameControllerAddMappingsFromFile("gamecontrollerdb.txt");
 
     /* Print information about the controller */
     for (i = 0; i < SDL_NumJoysticks(); ++i) {