Drop "Build-Depends: devscripts"
Drop "Build-Depends: devscripts"

> commit 1de3dd46132cf76536b6bf5eb037ef336fe595e3
> Author: Twan Wolthof <twan@xeago.nl>
> Date:   Wed Feb 4 16:34:19 2015 +0100
>
>     Add devscripts to debian's build-depends for checkbashisms

However, not necessary to build package itself, so it should be removed.

github/backup-utils,github/backup-utils