tests: mark test-check-pyflakes.t as requiring hg1.0+
hg does not yet run with py3, so if you try:
./run-tests.py --local test-check-pyflakes.t
... it will try to run the local hg, which does not work
and thus, hg locate will return no output to stdout (and
stderr is sent to /dev/null).
If you do:
./run-tests.py --with-hg=~/bin/hg test-check-pyflakes.t
Then it should work, if your hg is new enough to have
a locate command (hg0.6 does not have locate).