Reduce overlinking
The framework now ensure by itself that pthread is added to the link chain
as the last component if linked to kerberos hence avoid with out any explicit
addition prevent issue like CVE-2014-8475


git-svn-id: svn+ssh://svn.freebsd.org/base/head@275083 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f
Convert to LIBADD


git-svn-id: svn+ssh://svn.freebsd.org/base/head@275084 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f
Remove all remnant ugly LD<lbname> but atf one until the aft framework knows
about LIBADD


git-svn-id: svn+ssh://svn.freebsd.org/base/head@275086 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f