- Enable freedesktop sound theme by default (boo#1004919):
+ Set org.gnome.desktop.sound/theme-name to 'freedesktop' for
openSUSE.
+ Recommend sound-theme-freedesktop by gio-branding-openSUSE.
- Introdue @@IF_LEAP@@ logic into the .gschema.override.in file:
IF_LEAP is true if building for 'openSUSE' and sle_version is set
in prjconf. Apply IF_LEAP to the GNOME Software update
notifications.

- Once again disable GNOME Software update notifications (automatic
download of patches; openSUSE relies on gnome-settings-daemon's
internal update plugin for update notifications) (boo#997572).

- Enable freedesktop sound theme by default (boo#1004919):
+ Set org.gnome.desktop.sound/theme-name to 'freedesktop' for
openSUSE.
+ Recommend sound-theme-freedesktop by gio-branding-openSUSE.
- Introdue @@IF_LEAP@@ logic into the .gschema.override.in file:
IF_LEAP is true if building for 'openSUSE' and sle_version is set
in prjconf. Apply IF_LEAP to the GNOME Software update
notifications.