Fix warnings about static function and prototype

test/testscale.c

@@ -21,9 +21,6 @@
 #include <SDL3/SDL_main.h>
 #include "testutils.h"
 
-#define WINDOW_WIDTH  640
-#define WINDOW_HEIGHT 480
-
 static SDLTest_CommonState *state;
 
 typedef struct
@@ -36,8 +33,8 @@ typedef struct
     int scale_direction;
 } DrawState;
 
-DrawState *drawstates;
-int done;
+static DrawState *drawstates;
+static int done;
 
 /* Call this instead of exit(), so we can clean up SDL: atexit() is evil. */
 static void
@@ -47,7 +44,7 @@ quit(int rc)
     exit(rc);
 }
 
-void Draw(DrawState *s)
+static void Draw(DrawState *s)
 {
     SDL_Rect viewport;
 
@@ -77,7 +74,7 @@ void Draw(DrawState *s)
     SDL_RenderPresent(s->renderer);
 }
 
-void loop()
+static void loop(void)
 {
     int i;
     SDL_Event event;