Ian Moody <moz-ian@perix.co.uk> [Wed, 23 Oct 2019 15:07:56 +0100] rev 43349
setup: allow py3 install without env vars
5.2 is the first release of Mercurial where py3 support is expected to be
widely used, therefore we should allow installing it without hoop-jumping.
Differential Revision: https://phab.mercurial-scm.org/D7151