bup-cron: add support for Microsoft Snapshot, AKA Shadow Copy, AKA VSS
bup-cron: add support for Microsoft Snapshot, AKA Shadow Copy, AKA VSS

mountpattern cannot contain a space because the command to mount the shadow
copy would need to have quotes around the mountpattern, but they are seen
verbatim by vshadow, which cause a failure.

Signed-off-by: Patrick Rouleau <63d5de1631bda7ef519bef8dad039f592a2f1542@gmail.com>

anarcat/bup-cron,anarcat/bup-cron,blueyed/bup-cron,blueyed/bup-cron