load-nq-clim: clx-interface depends on backend/clx/port, and soon graft.

  * And the problems with a hand-maintained linearization of the
true dependency graph begin to raise their ugly head.  At some
recent point, clx-interface gained a dependency on the CLX PORT
but the dependency graph wasn't updated.  And soon we can expect
it to depend on the GRAFT implementation, plus a bunch of sheet
packages.

  * Relocate clx-interface to the bottom of the load list, to at
least keep things working for now.