Correctly set loop device to use direct io
Correctly set loop device to use direct io

(cherry picked from commit 1b88cae299f6b60c1066f1dbe424660decffb5da)

# Conflicts:
#	mount_helper/main.cpp

uroni/urbackup_backend,uroni/urbackup_backend,uroni/urbackup_backend,uroni/urbackup_backend,uroni/urbackup_backend,uroni/urbackup_backend,uroni/urbackup_backend