Another compilation fix for wxRibbon under OS X.

Include Carbon/Carbon.h to get kThemeBrushToolbarBackground declaration.

Closes #11203.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@61957 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/ribbon/art_aui.cpp

@@ -34,6 +34,8 @@
 #include "wx/msw/private.h"
 #elif defined(__WXMAC__)
 #include "wx/osx/private.h"
+// only for kThemeBrushToolbarBackground
+#include <Carbon/Carbon.h>
 #endif
 
 wxRibbonAUIArtProvider::wxRibbonAUIArtProvider()