libgovirt: clean up

- Split outputs to prevent closure contamination with propagated dependencies’ dev outputs.
- Use mirror URL.
- Add update script (also change source URL so it can be auto-updated).
- Correct dependencies:
  - Even though glib is propagated by other dependencies, let’s add it here as well for completeness.
  - libsoup should not need to be propagated.
- Add gobject-introspection (on by default with meson).
- Use correct non-deprecated license.
- Reduce scope of lib.

Ideally, we would also switch to Meson but it currently specifies dependencies incorrectly:
https://gitlab.gnome.org/GNOME/libgovirt/-/merge_requests/15

pkgs/applications/virtualization/libgovirt/default.nix

@@ -2,38 +2,52 @@
 , stdenv
 , fetchurl
 , glib
+, gnome
 , librest
 , libsoup
 , pkg-config
+, gobject-introspection
 }:
 
-with lib;
-
 stdenv.mkDerivation rec {
   pname = "libgovirt";
   version = "0.3.8";
 
+  outputs = [ "out" "dev" ];
+
   src = fetchurl {
-    url = "https://download.gnome.org/sources/libgovirt/0.3/${pname}-${version}.tar.xz";
-    sha256 = "sha256-HckYYikXa9+p8l/Y+oLAoFi2pgwcyAfHUH7IqTwPHfg=";
+    url = "mirror://gnome/sources/libgovirt/${lib.versions.majorMinor version}/${pname}-${version}.tar.xz";
+    sha256 = "HckYYikXa9+p8l/Y+oLAoFi2pgwcyAfHUH7IqTwPHfg=";
   };
 
-  enableParallelBuilding = true;
-
   nativeBuildInputs = [
     pkg-config
+    gobject-introspection
+  ];
+
+  buildInputs = [
+    libsoup
   ];
 
   propagatedBuildInputs = [
+    glib
     librest
-    libsoup
   ];
 
-  meta = {
+  enableParallelBuilding = true;
+
+  passthru = {
+    updateScript = gnome.updateScript {
+      packageName = pname;
+      versionPolicy = "none";
+    };
+  };
+
+  meta = with lib; {
     homepage = "https://gitlab.gnome.org/GNOME/libgovirt";
     description = "GObject wrapper for the oVirt REST API";
     maintainers = [ maintainers.amarshall ];
     platforms = platforms.linux;
-    license = licenses.lgpl21;
+    license = licenses.lgpl21Plus;
   };
 }