acl: Complete the 2010-08-10 fix.

* lib/file-has-acl.c (file_has_acl) [HP-UX]: Also test against ENOTSUP.
* lib/set-mode-acl.c (qset_acl) [HP-UX]: Likewise.
* lib/copy-acl.c (qcopy_acl) [HP-UX]: Test for the errno values
explicitly.
* tests/test-sameacls.c (main) [HP-UX]: Also test against ENOTSUP.
Reported in <http://debbugs.gnu.org/db/60/6053.html>.