Suppress unused variable warning in wxRichTextObject code.

Put the variable used only inside #if 0'd code inside #if 0 itself
(it would be better to get rid of this entirely, of course...).

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@77474 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/richtext/richtextbuffer.cpp

@@ -1196,7 +1196,9 @@ bool wxRichTextObject::LayoutToBestSize(wxDC& dc, wxRichTextDrawingContext& cont
     int style)
 {
     wxRect availableChildRect = AdjustAvailableSpace(dc, buffer, parentAttr, attr, availableParentSpace, availableContainerSpace);
+#if 0
     wxRect originalAvailableRect = availableChildRect;
+#endif
     Layout(dc, context, availableChildRect, availableContainerSpace, style);
 
     wxSize maxSize = GetMaxSize();