compat: don't rely on cpython-specific builtins manipulation
Pierre Augier signaled on the mailing list that this fails on Pypy and pointed
out the correct solution.
Differential Revision: https://phab.mercurial-scm.org/D11732
@echo off
powershell -NoProfile -ExecutionPolicy unrestricted -Command "& '%~dp0\editmergeps.ps1' %*"