Removed SDL_HINT_MOUSE_RELATIVE_MODE_WARP

This complicated mouse handling and is a rarely tested path. Real relative mode is much better performance and higher precision.

test/testautomation_hints.c

@@ -11,7 +11,6 @@ static const char *HintsEnum[] = {
     SDL_HINT_GAMECONTROLLERCONFIG,
     SDL_HINT_JOYSTICK_ALLOW_BACKGROUND_EVENTS,
     SDL_HINT_MAC_CTRL_CLICK_EMULATE_RIGHT_CLICK,
-    SDL_HINT_MOUSE_RELATIVE_MODE_WARP,
     SDL_HINT_ORIENTATIONS,
     SDL_HINT_RENDER_DIRECT3D_THREADSAFE,
     SDL_HINT_RENDER_VSYNC,
@@ -28,7 +27,6 @@ static const char *HintsVerbose[] = {
     "SDL_GAMECONTROLLERCONFIG",
     "SDL_JOYSTICK_ALLOW_BACKGROUND_EVENTS",
     "SDL_MAC_CTRL_CLICK_EMULATE_RIGHT_CLICK",
-    "SDL_MOUSE_RELATIVE_MODE_WARP",
     "SDL_ORIENTATIONS",
     "SDL_RENDER_DIRECT3D_THREADSAFE",
     "SDL_RENDER_VSYNC",