tests: opt into python3 when testing virtualenv installation
Otherwise it complains that Mercurial requires '~=2.7'. Since the existing
linux py3 test doesn't flag this, I'm assuming that virtualenv simply isn't
installed on that system.
Differential Revision: https://phab.mercurial-scm.org/D7111
# See http://EditorConfig.org for the specification
root = true
[*.py]
indent_size = 4
indent_style = space
trim_trailing_whitespace = true
[*.{c,h}]
indent_size = 8
indent_style = tab
trim_trailing_whitespace = true
[*.t]
indent_size = 2
indent_style = space
trim_trailing_whitespace = false