[gtkmm] Created tag 4.2.0

[Kjell Ahlstedt <kjellahl src gnome org>]

The unsigned tag '4.2.0' was created.

Tagger: Kjell Ahlstedt <kjellahlstedt gmail com>
Date: 1621758809 +0200

    4.2.0

Changes since the last tag '4.0.1':

Chun-wei Fan (4):
      g[d|t]kmmconfig.h.*: Don't dllimport on MinGW
      gtk/gtkmm/*.h: Export class selectively as needed
      NMake Makefiles: Some cleanups and improvements
      meson.build: Clean up MSVC build flags

Kjell Ahlstedt (14):
      Merge branch 'master' into 'master'
      Meson build: Make it possible to use gtkmm as a subproject
      Meson build: No implicit_include_directories
      Meson build: No implicit_include_directories
      Gtk::Stack::get_pages(): Return a Gtk::SelectionListModelImpl
      Subprojects can use meson.add_dist_script() if meson.version() >= 0.58.0
      Fix build as subproject without building documentation
      Add dependencies to Doxygen tag files in subprojects
      Gdk, Gtk: Regenerate docs.xml and .defs files
      Add Gdk::Device::get_timestamp(), Gtk::IconTheme::has_gicon() etc.
      Gtk::ShortcutController: Add get_scope()
      Builder demo: Make the keyboard shortcuts work
      gtk_docs_override.xml: Fix substitution of GTK_SHORTCUT_SCOPE_*
      4.2.0

Mingli Yu (1):
      meson.build: use relative path