evolve: fix progress display with hg<4.7
Since d1aab9d82f5b (evolve: adapt for deprecated ui.progress(),
2019-01-14), the "item", "units" and "total" are all set to default
values. The last one is especially bad since it results in a "spinner"
instead of a progress bar.
# utility to setup pythonpath to point into the tested repository
export SRCDIR="`dirname $TESTDIR`"
if [ -n "$PYTHONPATH" ]; then
export HGTEST_ORIG_PYTHONPATH=$PYTHONPATH
if uname -o | grep -q Msys; then
export PYTHONPATH="$SRCDIR;$PYTHONPATH"
else
export PYTHONPATH=$SRCDIR:$PYTHONPATH
fi
else
export PYTHONPATH=$SRCDIR
fi