Bug#896743: grc: missing build dependency on dh-python

[Adrian Bunk]

Source: grc
Version: 1.11.1-1
Severity: serious

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

...
dh_python3
make: dh_python3: Command not found
make: *** [debian/rules:53: binary-indep] Error 127