git: 8b83ef067441..0b4a06ab29a0 - vendor/bc - vendor branch updated

[Stefan Eßer]

The branch vendor/bc has been updated by se:

URL: https://cgit.FreeBSD.org/src/log/?id=8b83ef067441..0b4a06ab29a0

0b4a06ab29a0 vendor/bc: upgrade to version 6.7.2