When we get a kCGEventTapDisabledByTimeout or
kCGEventTapDisabledByUserInput, the event tap would perform an invalid
memory access. void pointers are so fun.
This code only runs if you explicitly build with SDL_MAC_NO_SANDBOX.
If the app is in landscape mode and the user presses the power button, a pause
is followed immediately by a surfaceChanged event because the lock screen
is shown in portrait mode. This triggers a "false" resume.
So, we just pause and resume following the onWindowFocusChanged events.
Also, wait for SDL_APP_WILLENTERBACKGROUND and SDL_APP_DIDENTERBACKGROUND before
blocking the event pump.