Enable SDL_LoadObject on iOS 8+ and tvOS.

premake/projects/SDL2.lua

@@ -369,7 +369,7 @@ SDL_project "SDL2"
 			["SDL_AUDIO_DRIVER_COREAUDIO"] = 1,
 			["SDL_JOYSTICK_MFI"] = 1,
 			["SDL_HAPTIC_DISABLED"] = 1,
-			["SDL_LOADSO_DISABLED"] = 1,
+			["SDL_LOADSO_DLOPEN"] = 1,
 			["SDL_THREAD_PTHREAD"] = 1,
 			["SDL_THREAD_PTHREAD_RECURSIVE_MUTEX"] = 1,
 			["SDL_TIMER_UNIX"] = 1,