[gtkmm] Created tag 3.24.2

[Kjell Ahlstedt <kjellahl src gnome org>]

The unsigned tag '3.24.2' was created.

Tagger: Kjell Ahlstedt <kjellahlstedt gmail com>
Date: 1571928455 +0200

    3.24.2

Changes since the last tag '3.24.1':

Daniel Boles (2):
      Cursor: Fix meaning of comment about Cairo ref arg
      Window: Do not add 2nd ref to new Cairo::Surface

Kjell Ahlstedt (7):
      Gtk: Fix ownership of some GLists
      Gdk::PixbufAnimation[Iter]: Disable warnings from deprecated GTimeVal
      demos: Fix the source code listing
      Gtk::Builder docs: Describe how to use together with Glib::Property
      Remove PORTING
      Makefile.am: Don't distribute PORTING
      3.24.2