Merge pull request #172616 from theknyaa/fix-gtk-immodules-cache

gtk: fix missing immodules.cache

pkgs/development/libraries/gtk/3.x.nix

@@ -201,6 +201,8 @@ stdenv.mkDerivation rec {
     for f in $dev/bin/gtk-encode-symbolic-svg; do
       wrapProgram $f --prefix XDG_DATA_DIRS : "${shared-mime-info}/share"
     done
+  '' + lib.optionalString (stdenv.buildPlatform == stdenv.hostPlatform) ''
+    GTK_PATH="''${out:?}/lib/gtk-3.0/3.0.0/immodules/" ''${dev:?}/bin/gtk-query-immodules-3.0 > "''${out:?}/lib/gtk-3.0/3.0.0/immodules.cache"
   '';
 
   # Wrap demos