Bug#839460: python-tz: FTBFS: Tests failures

[Sandro Tosi]

> If the failure looks somehow time/timezone related:
> Note that this rebuild was performed without the 'tzdata' package
> installed in the chroot. tzdata used be (transitively) part of
> build-essential, but it no longer is. If this package requires it to
> build, it should be added to build-depends. For the release team's
> opinion on this, see
> https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=836940#185

this looks a lot like the reason this is happening. it might be also
worth to upgrade to the latest version of pytz: pytz maintainers, are
you planning on update this package soon? thanks!