theme: load icons as Gtk does with fallback and RTL support

Forwarded: yes, https://gitlab.gnome.org/GNOME/mutter/merge_requests/62

Gbp-Pq: Name theme-load-icons-as-Gtk-does-with-fallback-and-RTL-suppor.patch

theme: use gtk_render_icon_suface to paint button icon

This will properly take care of the icon transformations
and of the shadow.

Fixes #100

Bug: https://gitlab.gnome.org/GNOME/mutter/issues/100
Bug-Ubuntu: https://bugs.launchpad.net/ubuntu/+source/mutter/+bug/1764558
Forwarded: yes, https://gitlab.gnome.org/GNOME/mutter/merge_requests/62

Gbp-Pq: Name theme-use-gtk_render_icon_suface-to-paint-button-icon.patch

mutter (3.30.2-4) unstable; urgency=medium

  * Add -Wl,-O1 to our LDFLAGS
  * Bump Standards-Version to 4.3.0

[dgit import unpatched mutter 3.30.2-4]

Import mutter_3.30.2-4.debian.tar.xz

[dgit import tarball mutter 3.30.2-4 mutter_3.30.2-4.debian.tar.xz]

Import mutter_3.30.2.orig.tar.xz

[dgit import orig mutter_3.30.2.orig.tar.xz]