Bug#857338: systemd-sysv: pre-depends fails to resolve in cross-architecture debootstrap from jessie

[Daniel James <daniel@64studio.com>]

Hi Neil,

We experienced this issue on a jessie amd64 build machine while building
for an armhf target, and resolved it by upgrading the build machine to
debootstrap 1.0.86~bpo8+1 from jessie-backports.

Cheers!

Daniel