[gtk-osx] Document gtk-osx-obsolete.modules, remove include of deleted gtk-osx-themes.modules

[John Ralls <jralls src gnome org>]

commit 05f350bc6003eb30a1cd512e4f31cdcbcdca72b3
Author: John Ralls <jralls ceridwen us>
Date:   Mon Apr 12 12:29:16 2021 -0700

    Document gtk-osx-obsolete.modules, remove include of deleted gtk-osx-themes.modules

 modulesets-stable/gtk-osx.modules | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)
---
diff --git a/modulesets-stable/gtk-osx.modules b/modulesets-stable/gtk-osx.modules
index 0823c9a4..5bfa9ef7 100644
--- a/modulesets-stable/gtk-osx.modules
+++ b/modulesets-stable/gtk-osx.modules
@@ -34,9 +34,13 @@
        - gtk-osx-javascript.modules: GJS and its Mozilla JS (aka
          spidermonkey) dependency.
        - gtk-osx-gstreamer.modules: GStreamer library and modules.
-       - gtk-osx-themes.modules: Gtk2 Theming engines. Obsolete.
        - gtk-osx-network.modules: The network/crypto stack and WebKit.
        - gtk-osx-random.modules: "random stuff", has apps for testing GTK+.
+
+       There's one more moduleset, gtk-osx-obsolete.modules, that
+       contains add-on modules that are used with gtk+-2 based
+       applications. It's not included here: If you need it include it
+       in your project's moduleset directly.
   -->
 
   <include href="gtk-osx-bootstrap.modules"/>
@@ -46,7 +50,6 @@
   <include href="gtk-osx-network.modules"/>
   <include href="gtk-osx-python.modules"/>
   <include href="gtk-osx-random.modules"/>
-  <include href="gtk-osx-themes.modules"/>
 
   <!-- Dummy meson module to shut up a jhbuild warning. -->
   <systemmodule id="meson">