Re-add SDL_HAPTIC_SQUARE for SDL 3.0

Fixes https://github.com/libsdl-org/SDL/issues/8753
Closes https://github.com/libsdl-org/SDL/pull/8831
Closes https://github.com/libsdl-org/SDL/pull/8783

test/testhaptic.c

@@ -351,9 +351,8 @@ HapticPrintSupported(SDL_Haptic *ptr)
     if (supported & SDL_HAPTIC_SINE) {
         SDL_Log("      sine\n");
     }
-    /* !!! FIXME: put this back when we have more bits in 2.1 */
-    /* if (supported & SDL_HAPTIC_SQUARE)
-        SDL_Log("      square\n"); */
+    if (supported & SDL_HAPTIC_SQUARE)
+        SDL_Log("      square\n");
     if (supported & SDL_HAPTIC_TRIANGLE) {
         SDL_Log("      triangle\n");
     }