Shocking four-year-old bug in collect/coll.

This originates to a commit on 2011-10-21. In that commit, I
attempted to make until/last clauses have visibility to the
bindings in the collect body (even though those are
discarded). The problem is that the until/last clause is tried
whether or not the body succeeds. When the body fails, no
bindings emanate from it. In that case, the until/last clause
is wrongly evaluated in an environment with no bindings
whatsoever, meaning that even bindings that existed before the
collect are not available to it.

* match.c (h_coll, v_collect): Evaluate the last/until clause
using the collect body bindings only if those bindings are not
nil, otherwise use the original bindings from before entry
into the collect.

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