Follow up to experimental eager evar unification in bcba6d1bc9:

Observing that systematic eager evar unification makes unification
works better, for instance in setoid rewrite (ATBR, SemiRing.v), we
add a new flag use_evars_eagerly_in_conv_on_closed_terms which is put
to true only in Rewrite.rewrite_core_unif_flags (empirically, this
makes the "rewrite" from rewrite.ml working again on examples which
were previously treated by use_metas_eagerly_in_conv_on_closed_terms).

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