Check that internal dependencies are supplied on --exact-configuration

Previously, the code would unconditionally report that internal
dependencies were satisfiable, even if --exact-configuration was
provided, we're in per-component mode, and the internal lib was
NOT supplied via a --dependency parameter.  Now ./Setup configure
correctly fails at the right stage.

There is a bit of wibbling to do with compatibility package names.
I think I've gotten it right.

Signed-off-by: Edward Z. Yang <ezyang@cs.stanford.edu>