Fix EPERM handling when getting extended attributes fails on macOS
Fix EPERM handling when getting extended attributes fails on macOS

(cherry picked from commit 2dac2b39fa37aa77903b156c82af35ef2eac6032)

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