git: a60ef1802a36..5d58a5157172 - vendor/bc - vendor branch updated

[Stefan Eßer]

The branch vendor/bc has been updated by se:

URL: https://cgit.FreeBSD.org/src/log/?id=a60ef1802a36..5d58a5157172

5d58a5157172 vendor/bc: update to version 5.1.0