clean up wxCairoRenderer initialization mess

Remove unused Unload(), wxCairoCleanUp(), m_loaded and gCairoRenderer, and redundant Load()
and EnsureIsLoaded(). Just call wxCairoInit() directly, and for GTK do nothing at all.


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@73098 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/common/cairo.cpp

@@ -384,11 +384,6 @@ bool wxCairoInit()
     return wxCairo::Initialize();
 }
 
-void wxCairoCleanUp()
-{
-    wxCairo::CleanUp();
-}
-
 extern "C"
 {