Adjusted cf3_with_library to handle case where --with-feature is not defined

In the case of pam and lmdb, due to checks for brew, --with-pam and --with-lmdb, if not specified by the user, are not defined.
This resulted in -R/lib being added to LMDB_LDFLAGS and PAM_LDFLAGS and by appending: CORE_LDFLAGS.

This -R/lib adds an RPATH which rhel-10 rpmbuild complains about since it is a standard path that should not be included in RPATHS.

Ticket: ENT-13016
Changelog: none
(cherry picked from commit 2264624)

Author: craigcomstock

m4/cf3_with_library.m4

@@ -84,7 +84,8 @@ AC_DEFUN([CF3_WITH_LIBRARY],
   if test "x$with_[$1]" != xyes &&
      test "x$with_[$1]" != xcheck &&
      test "x$with_[$1]" != x/usr &&
-     test "x$with_[$1]" != x/
+     test "x$with_[$1]" != x/ &&
+     test -n "$with_[$1]"
   then
     ULN[]_LDFLAGS="$ULN[]_LDFLAGS -R$with_[$1]/lib"
   fi