Disable options that don't work with wxGTK in wx/chkconf.h.

Disable options that don't work with wxGTK in wx/chkconf.h.

When building wxGTK under Windows, some MSW-specific options can be defined
but can't be implemented when using GTK, forcefully disable them.

Also a few others that could be implemented but that don't work currently.

Finally, forcefully enable Cairo support as wxGTK always needs it.

Closes #14412.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@71796 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775