Bug#939632: blhc: false positives with Python cython Compiling

[PICCA Frederic-Emmanuel]

> thanks for the report. Should be fixed in 5fa7a26 ("Fix false
> positive in non-verbose check for cython's .pyx files",
> 2019-09-07) [1].

It will help with the salsa-ci  status :)

Cheers

Frederic