gcr: use wrapGAppsHook

The manual wrapProgram invocation missed binaries in libexec.

pkgs/development/libraries/gcr/default.nix

@@ -16,7 +16,7 @@
 , openssh
 , systemd
 , gobject-introspection
-, makeWrapper
+, wrapGAppsHook
 , libxslt
 , vala
 , gnome
@@ -53,7 +53,7 @@ stdenv.mkDerivation rec {
     gettext
     gobject-introspection
     libxslt
-    makeWrapper
+    wrapGAppsHook
     vala
     shared-mime-info
   ];
@@ -96,11 +96,6 @@ stdenv.mkDerivation rec {
     patchShebangs meson_post_install.py
   '';
 
-  preFixup = ''
-    wrapProgram "$out/bin/gcr-viewer" \
-      --prefix XDG_DATA_DIRS : "$GSETTINGS_SCHEMAS_PATH"
-  '';
-
   passthru = {
     updateScript = gnome.updateScript {
       packageName = pname;