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.

lib/libpam/modules/pam_unix/Makefile

@@ -40,8 +40,8 @@ LIB=	pam_unix
 SRCS=	pam_unix.c
 MAN=	pam_unix.8
 
-DPADD= ${LIBUTIL} ${LIBCRYPT}
-LDADD= -lutil -lcrypt
+DPADD+= ${LIBUTIL} ${LIBCRYPT}
+LDADD+= -lutil -lcrypt
 
 .if ${MK_NIS} != "no"
 CFLAGS+= -DYP