pseudo.inc: Clean up backport of version update to 1.6.2
This uprevs pseudo to 1.6. This merges in all of the existing
fixes, and also adds partial support for extended attributes,
including storing arbitrary extended attributes in the database,
and also interpreting the posix permissions ACLs as chmod
requests.
The extended attribute support means we need xattr.h, the simplest
way to be sure of this is to build attr before pseudo, which doesn't
take long.
