v8.4: Fixed synchronicity of filter with evar context in new_goal_with.

git-svn-id: svn+ssh://scm.gforge.inria.fr/svn/coq/branches/v8.4@16174 85f007b7-540e-0410-9357-904b9bb8a0f7
v8.4: Fixing bug #2969 (admit failing after Grab Existential Variables due
to inconsistency in using evar_hyps which is unfiltered and evar_env
which is filtered).

git-svn-id: svn+ssh://scm.gforge.inria.fr/svn/coq/branches/v8.4@16176 85f007b7-540e-0410-9357-904b9bb8a0f7