login-utils: Enable building util-linux against OpenPAM

OpenPAM is compatible with util-linux, with a few changes, namely
using OpenPAM's conversation function, openpam_ttyconv.

We check for Linux-PAM by querying for security/pam_misc.h, and OpenPAM
by querying for security/openpam.h.

Signed-off-by: Will Johansson <will.johansson@gmail.com>
libblkid: superblocks: Add function blkid_probe_set_utf8_id_label for setting utf8 id label
libblkid: udf: Fix reading LABEL, add support for UUID and other udf identifiers
tests: update UDF test (add identifiers)