'cp -p' attempts to copy NFSv4 ACL extended attributes when preserving
permissions. On filesystems that do not support these xattrs (e.g., ext4),
this results in `Operation not supported` and causes 'cp' to fail.
Add explicit skip entries for these attributes in /etc/xattr.conf
so libattr ignores them during copy operations. This is needed to get
bitbake builds to work when using download cache from NFS4 mount.
Change-Id: I3dabb065c4d9928121fe14d0fdc896c7415bdcb9
Reviewed-by: Toni Saario <toni.saario@qt.io>
