[whatmaps] Bug#896742: whatmaps: missing build dependency on dh-python

[Adrian Bunk]

Source: whatmaps
Version: 0.0.12-2
Severity: serious
Tags: buster sid

https://tests.reproducible-builds.org/debian/rb-pkg/unstable/amd64/whatmaps.html

...
 fakeroot debian/rules clean
dh clean --with python3 --buildsystem=pybuild
dh: unable to load addon python3: Can't locate Debian/Debhelper/Sequence/python3.pm in @INC (you may need to install the Debian::Debhelper::Sequence::python3 module) (@INC contains: /etc/perl /usr/local/lib/x86_64-linux-gnu/perl/5.26.2 /usr/local/share/perl/5.26.2 /usr/lib/x86_64-linux-gnu/perl5/5.26 /usr/share/perl5 /usr/lib/x86_64-linux-gnu/perl/5.26 /usr/share/perl/5.26 /usr/local/lib/site_perl /usr/lib/x86_64-linux-gnu/perl-base) at (eval 7) line 1.
BEGIN failed--compilation aborted at (eval 7) line 1.

make: *** [debian/rules:13: clean] Error 2