Closes: https://gitlab.gnome.org/GNOME/gtk/issues/1737
Don't export any functions taking or returning MacOS types in
gdkquartz.h, gdkprivate-quartz.h, or any header that either includes.
The GdkQuartz internal functions are moved to a new header
gdkinternal-quartz.h, the functions used by quartz-specific
Gtk files are moved to another new header gdkquartz-gtk-only.h, and
the key and event enums to a new header gdkkeys-quartz.h.
GtkStatusIcon is using a problematic, XEmbed-based protocol under X,
and we want to get rid of it eventually. Document our intentions by
marking GtkStatusIcon as deprecated.
https://bugzilla.gnome.org/show_bug.cgi?id=734826
