Rely on kernel to know if a name is already used so as to be consistent with it.

Maybe could we keep only the kernel check, but message would
certainly need to be reformulated then.

For instance, the message was previously different for an attempt to
redefine a name whether this name was in the same section or not.

git-svn-id: svn+ssh://scm.gforge.inria.fr/svn/coq/trunk@14528 85f007b7-540e-0410-9357-904b9bb8a0f7

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