Fix some mysterious warnings when using enqueue.

src/types.nim

@@ -898,14 +898,15 @@ type BlendLoader* = ref object of Loader
         (string, seq[Varying], OrderedTable[string, string], OrderedTable[string, TexturePixels])] ## private
     resource*: LoadableResource
     
-template enqueue*(renderer: RenderManager, fun: proc()) =
+template enqueue*(renderer: RenderManager, fun: untyped) =
     ## Run a proc after the renderer has been initialized.
     ## 
     ## If it was already initialized, it runs it immediately.
+    let f = fun
     if renderer.initialized:
-        fun()
+        f()
     else:
-        renderer.queue.add fun
+        renderer.queue.add f
 
 when not defined(release):
     from sugar import dump