tests: fix test-prune.t breakage
test-prune.t was broken due to 91d28bd0e04e in upstream Mercurial, which made
hidden commits visible when a local tag made the commit reachable. The fix is to
delete the tag in the test.
all: tutorials/tutorial.rst static/logo-evolve.ico
sphinx-build . ../html/
tutorials/tutorial.rst: tutorials/tutorial.t
python test2rst.py tutorials/
static/logo-evolve.ico: static/logo-evolve.svg
convert -resize 36x36 static/logo-evolve.svg static/logo-evolve.ico