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branch: delete obsolete message about changing branch of obsolete commit

Authored by martinvonz.

Description

branch: delete obsolete message about changing branch of obsolete commit

We now rely on rewriteutil.precheck() to check for divergence, so we
don't need the extra check in cmdutil.changebranch(). The former
check is a little less strict in that it allows you to rewrite a
commit without non-obsolete successors.

Differential Revision: https://phab.mercurial-scm.org/D10519

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