Use GetFileSizeEx to get file size on Windows
Use GetFileSizeEx to get file size on Windows

(cherry picked from commit ddbd42c042e15e2f64b3e3b492bf25912b16923f)

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