posix: delete Python 2 posixfile()
The comment no longer makes sense since the stdlib open() behaves
the way we want on Python 3. So it was removed.
Differential Revision: https://phab.mercurial-scm.org/D12288
# __init__.py - Startup and module loading logic for Mercurial.
#
# Copyright 2015 Gregory Szorc <gregory.szorc@gmail.com>
#
# This software may be used and distributed according to the terms of the
# GNU General Public License version 2 or any later version.
# Allow 'from mercurial import demandimport' to keep working.
import hgdemandimport
demandimport = hgdemandimport