Hopefully finish removing the old wxCocoa port.

Get rid of the rest of __WXCOCOA__ tests in the sources.

Drop configure option for using it.

Also remove the documentation for this port.

This should have also been part of r76735.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@76815 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/dirdlg.h

@@ -104,8 +104,7 @@ protected:
 #elif defined(__WXMAC__)
     #include "wx/osx/dirdlg.h"      // Native Mac
 #elif defined(__WXMOTIF__) || \
-      defined(__WXX11__)   || \
-      defined(__WXCOCOA__)
+      defined(__WXX11__)
     #include "wx/generic/dirdlgg.h"     // Other ports use generic implementation
     #define wxDirDialog wxGenericDirDialog
 #endif