Restore the upstream (and documented) behavior of searching for modules

both in /usr/lib and /usr/local/lib, thus simplifying the use of modules
from ports, without breaking the compat32 case again.

PR:		191151
MFC after:	3 weeks

contrib/openpam/lib/libpam/openpam_constants.c

@@ -137,6 +137,9 @@ const char *openpam_policy_path[] = {
 const char *openpam_module_path[] = {
 #ifdef OPENPAM_MODULES_DIRECTORY
 	OPENPAM_MODULES_DIRECTORY,
+#elif COMPAT_32BIT
+	"/usr/lib32",
+	"/usr/local/lib32",
 #else
 	"/usr/lib",
 	"/usr/local/lib",

lib/libpam/Makefile.inc

@@ -27,7 +27,6 @@
 CFLAGS+=	-DOPENPAM_DEBUG
 
 SHLIB_MAJOR=	5
-PAM_MOD_DIR=	${LIBDIR}
 
 STATIC_CFLAGS+=	-DOPENPAM_STATIC_MODULES
 

lib/libpam/libpam/Makefile

@@ -155,7 +155,6 @@ MLINKS=	pam.conf.5 pam.d.5
 CSTD?= c99
 CFLAGS+= -I${.CURDIR} -I${OPENPAM}/include
 CFLAGS+= -DLIB_MAJ=${SHLIB_MAJOR}
-CFLAGS+= -DOPENPAM_MODULES_DIRECTORY='"${PAM_MOD_DIR:C/\/*$//}/"'
 CFLAGS+= -DHAVE_DLFUNC=1
 CFLAGS+= -DHAVE_FDLOPEN=1
 CFLAGS+= -DHAVE_FPURGE=1