Added missing header (cherry picked from commit a9a8719af896ac1536575498b55240608cdf9b3f)
Added missing header
(cherry picked from commit a9a8719af896ac1536575498b55240608cdf9b3f)

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