Martin von Zweigbergk <martinvonz@google.com> [Wed, 18 Apr 2018 22:54:11 -0700] rev 3682
evolve: add support for hg >= b4d85bc1
Mercurial commit b4d85bc1 deleted the wireproto module and its
contents are now in various other modules, so we can not even do
unchecked imports of it now.