gnu: gnome-backgrounds: Update to 3.28.0.

* gnu/packages/gnome.scm (gnome-backgrounds): Update to 3.28.0.
[build-system]: Use meson-build-system.

gnu/packages/gnome.scm

@@ -5882,7 +5882,7 @@ is complete it provides a graphical representation of each selected folder.")
 (define-public gnome-backgrounds
   (package
     (name "gnome-backgrounds")
-    (version "3.26.2")
+    (version "3.28.0")
     (source
      (origin
        (method url-fetch)
@@ -5891,8 +5891,8 @@ is complete it provides a graphical representation of each selected folder.")
                            name "-" version ".tar.xz"))
        (sha256
         (base32
-         "0kzrh5h0cfby3rhsy31d1w1c0rr3wcc845kv6zibqw1x8v9si2rs"))))
-    (build-system glib-or-gtk-build-system)
+         "1qgim0yhzjgcq172y4vp5hqz4rh1ak38a7pgi6s7dq0wklyrcnxj"))))
+    (build-system meson-build-system)
     (native-inputs
      `(("intltool" ,intltool)))
     (home-page "https://git.gnome.org/browse/gnome-backgrounds")