SDL API renaming: SDL_render.h

Fixes https://github.com/libsdl-org/SDL/issues/6883

test/testdrawchessboard.c

@@ -32,7 +32,7 @@ void DrawChessBoard()
     SDL_Rect rect, darea;
 
     /* Get the Size of drawing surface */
-    SDL_RenderGetViewport(renderer, &darea);
+    SDL_GetRenderViewport(renderer, &darea);
 
     for (; row < 8; row++) {
         column = row % 2;