hg: don't attempt to extend `sys.path` with the user site without `APPDATA`
This variable is created by the system and *should* be available, but
test-lfs-bundle.t has a test where it is explicitly unset. It wasn't caught
before because prior to 95af358fcdfe, it was limited to the py2exe binary. As a
precaution, fix both that and the pyoxidizer case that was causing the test to
fail.
Differential Revision: https://phab.mercurial-scm.org/D11354
#require docutils gettext
$ $TESTDIR/check-gendoc de
checking for parse errors
Die Dateien werden dem Projektarchiv beim n\xc3\xa4chsten \xc3\x9cbernehmen (commit) hinzugef\xc3\xbcgt. Um dies vorher r\xc3\xbcckg\xc3\xa4ngig zu machen, siehe:hg:`forget`. (esc)
warning: please have a space before :hg: