misc: Make SDL_OpenURL work with VisionOS, tvOS, etc.

(cherry picked from commit 7bbe6025be20c892fbba5678796c77454a8893e4)

src/misc/ios/SDL_sysurl.m

@@ -26,16 +26,17 @@
 int SDL_SYS_OpenURL(const char *url)
 {
     @autoreleasepool {
-
         NSString *nsstr = [NSString stringWithUTF8String:url];
         NSURL *nsurl = [NSURL URLWithString:nsstr];
         if (![[UIApplication sharedApplication] canOpenURL:nsurl]) {
             return SDL_SetError("No handler registerd for this type of URL");
         }
-        if (@available(iOS 10.0, *)) {
+        if (@available(iOS 10.0, tvOS 10.0, *)) {
             [[UIApplication sharedApplication] openURL:nsurl options:@{} completionHandler:^(BOOL success) {}];
         } else {
+            #ifndef SDL_PLATFORM_VISIONOS   /* Fallback is never available in any version of VisionOS (but correct API always is). */
             [[UIApplication sharedApplication] openURL:nsurl];
+            #endif
         }
         return 0;
     }