regex: closure operations don't output epsilon states.

* regex.c (nfa_closure, nfa_move_closure): Do not add epsilon
states to the output array. We only need to add them to the
stack for the spanning traversal. Epsilon states are not real
states; they are just a representation of the concept of
transitioning to multiple states at the same time.
When we add them to the output, they just end up being ignored
when nfa_move_closure is called again on that set, since it
only cares about states that have real transitions for a
character.

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