Temporary hack to address performance issues in https://github.com/libsdl-org/SDL/issues/6581#issuecomment-1327987916 (thanks @icculus!)

(cherry picked from commit 9c8369e097b229997875c0aeb4dc9cfdcde0e2b2)

src/SDL.c

@@ -519,13 +519,21 @@ SDL_Quit(void)
 void
 SDL_GetVersion(SDL_version * ver)
 {
+    static SDL_bool check_hint = SDL_TRUE;
+    static SDL_bool legacy_version = SDL_FALSE;
+
     if (!ver) {
         return;
     }
 
     SDL_VERSION(ver);
 
-    if (SDL_GetHintBoolean("SDL_LEGACY_VERSION", SDL_FALSE)) {
+    if (check_hint) {
+        check_hint = SDL_FALSE;
+        legacy_version = SDL_GetHintBoolean("SDL_LEGACY_VERSION", SDL_FALSE);
+    }
+
+    if (legacy_version) {
         /* Prior to SDL 2.24.0, the patch version was incremented with every release */
         ver->patch = ver->minor;
         ver->minor = 0;