tests/test-issue436

windows: avoid deleting non-empty reparse points

If a hg repository including working directory is a reparse point (directory
symlinked or a junction point), then using os.removedirs will remove the
reparse point erroneously. This is fixed by only removing directories if they
are empty.

#!/bin/sh

hg init a
cd a
hg -v log -v
hg -v log -v x
true