Adding void to empty function prototype parenthesis

test/testautomation_blit.c

@@ -33,7 +33,7 @@ Uint64 next(Uint64 state[2]) {
     return result;
 }
 static Uint64 rngState[2] = {1, 2};
-Uint32 getRandomUint32() {
+Uint32 getRandomUint32(void) {
     return (Uint32)next(rngState);
 }
 /* ================= Test Case Helper Functions ================== */

test/testgpu_spinning_cube.c

@@ -619,7 +619,7 @@ init_render_state(int msaa)
 
 static int done = 0;
 
-void loop()
+void loop(void)
 {
     SDL_Event event;
     int i;

test/testrelative.c

@@ -35,7 +35,7 @@ static void DrawRects(SDL_Renderer *renderer)
     SDLTest_DrawString(renderer, 0.f, 0.f, "Relative Mode: Enabled");
 }
 
-static void CenterMouse()
+static void CenterMouse(void)
 {
     /* Warp the mouse back to the center of the window with input focus to use the
      * center point for calculating future motion deltas.