Fix uninitialized variable warning when compiling tests with clang compiler

(cherry picked from commit 38e00946370a5f6e2d6c762cd9dcf6ec8ea3824d)

test/testautomation_rect.c

@@ -701,8 +701,8 @@ int rect_testIntersectRectEmpty(void *arg)
  */
 int rect_testIntersectRectParam(void *arg)
 {
-    SDL_Rect rectA;
-    SDL_Rect rectB = { 0 };
+    const SDL_Rect rectA = { 0, 0, 32, 32 };
+    const SDL_Rect rectB = { 0, 0, 32, 32 };
     SDL_Rect result;
     SDL_bool intersection;
 
@@ -956,8 +956,8 @@ int rect_testHasIntersectionEmpty(void *arg)
  */
 int rect_testHasIntersectionParam(void *arg)
 {
-    SDL_Rect rectA;
-    SDL_Rect rectB = { 0 };
+    const SDL_Rect rectA = { 0, 0, 32, 32 };
+    const SDL_Rect rectB = { 0, 0, 32, 32 };
     SDL_bool intersection;
 
     /* invalid parameter combinations */
@@ -1492,7 +1492,8 @@ int rect_testUnionRectInside(void *arg)
  */
 int rect_testUnionRectParam(void *arg)
 {
-    SDL_Rect rectA, rectB = { 0 };
+    const SDL_Rect rectA = { 0, 0, 32, 32 };
+    const SDL_Rect rectB = { 0, 0, 32, 32 };
     SDL_Rect result;
 
     /* invalid parameter combinations */