Use -lldap_r by default.

--- php-5.4.8/ext/ldap/config.m4.ldap_r
+++ php-5.4.8/ext/ldap/config.m4
@@ -117,7 +117,10 @@ if test "$PHP_LDAP" != "no"; then
     LDAP_PTHREAD=
   fi
 
-  if test -f $LDAP_LIBDIR/liblber.a || test -f $LDAP_LIBDIR/liblber.$SHLIB_SUFFIX_NAME; then
+  if test -f $LDAP_LIBDIR/libldap_r.$SHLIB_SUFFIX_NAME; then
+    PHP_ADD_LIBRARY_WITH_PATH(lber, $LDAP_LIBDIR, LDAP_SHARED_LIBADD)
+    PHP_ADD_LIBRARY_WITH_PATH(ldap_r, $LDAP_LIBDIR, LDAP_SHARED_LIBADD)
+  elif test -f $LDAP_LIBDIR/liblber.a || test -f $LDAP_LIBDIR/liblber.$SHLIB_SUFFIX_NAME; then
     PHP_ADD_LIBRARY_WITH_PATH(lber, $LDAP_LIBDIR, LDAP_SHARED_LIBADD)
     PHP_ADD_LIBRARY_WITH_PATH(ldap, $LDAP_LIBDIR, LDAP_SHARED_LIBADD)