debug: only print the layer and map errors once.

src/layer.cpp

@@ -47,7 +47,9 @@ Layer::~Layer()
 
 void Layer::Render(int x, int y, int z)
 {
-    Log::Error("FIXME: Layer::Render no longer works\n");
+    static int error = 1;
+    if (error && !(error = 0))
+        Log::Error("FIXME: Layer::Render no longer works\n");
 #if 0
     Scene *scene = Scene::GetDefault();
     for (int j = 0; j < height; j++)

src/map.cpp

@@ -95,7 +95,9 @@ Map::Map(char const *path)
                         if (n == data->ntilers - 1
                              || id < gids[n + 1])
                         {
-                            Log::Error("tilesets no longer work this way\n");
+                            static int error = 1;
+                            if (error && !(error = 0))
+                                Log::Error("tilesets no longer work this way\n");
                             //code = (data->tilesets[n] << 16) | (id - gids[n]);
                             break;
                         }