build-sys: enable chfn and chsh by default

The util-linux version (is the best:-) uses libuser,
so it usable for non-local users (LDAP, etc.).

Signed-off-by: Karel Zak <kzak@redhat.com>
build-sys: fix typo, set HAVE_LIBUUID

Signed-off-by: Karel Zak <kzak@redhat.com>