Fixing a new regresssion with 8.4 wrt to βι-normalization of created hyps.

Formerly, mk_refgoals in logic.ml was applying full βι on new Meta-based goals.
We simulate part of this βι-normalization in pose_all_metas_as_evars.

I suspect that we don't βι-normalize goals more than in 8.4 by doing
that, since all Metas would have eventually gone to mk_refgoals, but
difficult to know for sure as there were probably metas turned to
evars (and hence a priori not βι-normalized) even when logic.ml was
used more pervasively.

However, βι-normalizing is a priori a better heuristic than no
βι-normalizing, independently of what it was in 8.4 and before (even
if, ideally, I would personally lean towards preferring a
"chirurgical" substitution with reduction only at the place of
substitution).

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