proposed_upstream__doctest.path

proposed_upstream__doctest.path

# HG changeset patch
# User Julien Cristau <jcristau@debian.org>
# Date 1589916203 -7200
#      Tue May 19 21:23:23 2020 +0200
# Node ID de789b6b188b62cf38c5c5cfe760cff9a48c52f5
# Parent  3b7aabd02e11fcfc015b3a90a0c52d971a7b8a83
test: make test-doctest.py work when it's not run from a mercurial repo

This assumption fails when building and running tests from a source
tarball, e.g.

Differential Revision: https://phab.mercurial-scm.org/D8571

Gbp-Pq: Name proposed_upstream__doctest.path