git-remote-mediawiki: update tests to run with the new bin-wrapper
Until now, if git-remote-mediawiki was not installed, the test suite
copied it to the toplevel directory. This solution pollutes the
directory with untracked files. Plus, we would need to copy the new
git-mw.perl file to test it too.
Signed-off-by: Benoit Person <benoit.person@ensimag.fr> Signed-off-by: Matthieu Moy <matthieu.moy@grenoble-inp.fr> Signed-off-by: Junio C Hamano <gitster@pobox.com>