Rev 228065 (change bsd.own.mk -> bsd.init.mk) broke pam_unix.so by causing

Rev 228065 (change bsd.own.mk -> bsd.init.mk) broke pam_unix.so by causing
the LDADD/DPADD to lose the -lpam, and causing openpam_dynamic() to fail
due to "openpam_get_options" being undefined.

This would cause obscure console log messages like:
  openpam_dynamic(): No error: 0
  openpam_load_module(): no pam_unix.so found
and other helpful messages which are no help in diagnosing the problem.

Fortunately this change was not mfc'ed to 9.x, it isn't broken there.