Always use 64bit fsblkcnt_t
Always use 64bit fsblkcnt_t

(cherry picked from commit 6e41d07fb77be63bb33519b72fb1ce6f17de5c91)

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