Summary:
This is an old copy of Mercurial, saved to keep the Mercurial servers running
until we completely pull the plug on them. Neither EdenFS nor EdenSCM should
depend on it.

Reviewed By: mitrandir77

Differential Revision: D34081890

fbshipit-source-id: 78e2c07fae75b3f25aa492ece03308f736d42769