stupid: remove code that's only used by hg < 1.9 Mercurial 1.9 is over three years old at this point, so I'm willing to drop this code, as there's been an Ubuntu LTS release since then.

include Makefile hgsubversion/help/*.rst tests/fixtures/invalid_utf8.tar.gz
recursive-include tests *.py *.sh *.svndump *.txt