Protection against "Bad recursive type" in w_unify0 (bug #3036).

Morally, unification wants to unify "fun x:Meta => Meta"
with "fun x:nat => match x with ... end". Retyping is asked to
type "match x with ... end" in the context "x:Meta" where the
type of x has de facto been lost. Retyping fails.

I don't see an easy remedy since w_unify0 builds the unifier
lazily, and I'm not sure it is worth to propagate the unifier to
retyping so that it knows it. After all, the call to retyping in
w_unify0 is not so critical.

git-svn-id: svn+ssh://scm.gforge.inria.fr/svn/coq/trunk@16489 85f007b7-540e-0410-9357-904b9bb8a0f7

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