- Switch from mozjs to duktape:
* Add duktape-support.patch

Provides the same features as with mozjs, but is *much* smaller both during
build and runtime. Before, installing polkit needed 62.0 MiB, with this it's
just 16.3 MiB. (Tested in an opensuse/tumbleweed container).

I didn't encounter any errors while playing around with it in a Live CD.