virt-manager: Add back gstreamer plugins (#361351)

pkgs/applications/virtualization/virt-manager/default.nix

@@ -21,6 +21,7 @@
   xorriso,
   spiceSupport ? true,
   spice-gtk ? null,
+  gst_all_1 ? null,
 }:
 
 let
@@ -57,18 +58,23 @@ stdenv.mkDerivation rec {
     pkg-config
   ] ++ lib.optional stdenv.hostPlatform.isDarwin desktopToDarwinBundle;
 
-  buildInputs = [
-    python3
-    libvirt-glib
-    vte
-    dconf
-    gtk-vnc
-    adwaita-icon-theme
-    gsettings-desktop-schemas
-    libosinfo
-    gtksourceview4
-  ] ++ lib.optional spiceSupport spice-gtk;
-
+  buildInputs =
+    [
+      python3
+      libvirt-glib
+      vte
+      dconf
+      gtk-vnc
+      adwaita-icon-theme
+      gsettings-desktop-schemas
+      libosinfo
+      gtksourceview4
+    ]
+    ++ lib.optionals spiceSupport [
+      gst_all_1.gst-plugins-base
+      gst_all_1.gst-plugins-good
+      spice-gtk
+    ];
   preFixup = ''
     glib-compile-schemas $out/share/gsettings-schemas/${pname}-${version}/glib-2.0/schemas