Rename --with-cocoa configure switch to --with-old_cocoa to avoid confusion.

Rename --with-cocoa configure switch to --with-old_cocoa to avoid confusion.

Change --with-cocoa to be synonym for --with-osx_cocoa, add --with-carbon as a
synonym for --with-osx_carbon for consistency and --with-osx as a synonym for
--with-mac.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@62868 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775