Replaced tabs with spaces in test programs.

test/testgl2.c

@@ -357,7 +357,7 @@ main(int argc, char *argv[])
             SDL_Log("SDL_GL_ACCELERATED_VISUAL: requested %d, got %d\n", accel,
                    value);
         } else {
-			SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Failed to get SDL_GL_ACCELERATED_VISUAL: %s\n",
+            SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Failed to get SDL_GL_ACCELERATED_VISUAL: %s\n",
                    SDL_GetError());
         }
     }