[PATCH 3 of 4] run-tests: add support for RTUNICODEPEDANTRY environment variable

[timeless]

Pierre-Yves David <pierre-yves.david at ens-lyon.org> wrote:
> Piotr work on white-listing environment variable use HGTEST_* as a prefix
> for variable. Maybe we should use this instead of RT*. (But It may not make
> much sense for this one).

RTUNICODEPEDANTRY only impacts run-tests itself. I did consider using
HGTEST or something and decided against it.

If you happen to be running run-tests inside run-tests and don't want
RTUNICODEPEDANTRY to descend to the next layer, you can change the
tests. and by "you", I really mean "I", since I really don't expect
anyone else to use this feature.