base: Don't recompile or list jquery.min.js

We have a global rule which does this for .min.js files, but make
this one an exception.

Reviewed-by: Marius Vollmer <marius.vollmer@redhat.com>
base: Automatically register jQuery as an AMD module

If jQuery didn't get a chance to register itself as an AMD module
because it loaded before cockpit.js, we do so on its behalf.

Closes #1526
Reviewed-by: Marius Vollmer <marius.vollmer@redhat.com>