Hopefully fixes build with IBM's LDAP library

ext/ldap/ldap.c

@@ -226,7 +226,9 @@ PHP_MINIT_FUNCTION(ldap)
 	REGISTER_LONG_CONSTANT("LDAP_OPT_PROTOCOL_VERSION", LDAP_OPT_PROTOCOL_VERSION, CONST_PERSISTENT | CONST_CS);
 	REGISTER_LONG_CONSTANT("LDAP_OPT_ERROR_NUMBER", LDAP_OPT_ERROR_NUMBER, CONST_PERSISTENT | CONST_CS);
 	REGISTER_LONG_CONSTANT("LDAP_OPT_REFERRALS", LDAP_OPT_REFERRALS, CONST_PERSISTENT | CONST_CS);
+#ifdef LDAP_OPT_RESTART
 	REGISTER_LONG_CONSTANT("LDAP_OPT_RESTART", LDAP_OPT_RESTART, CONST_PERSISTENT | CONST_CS);
+#endif
 	REGISTER_LONG_CONSTANT("LDAP_OPT_HOST_NAME", LDAP_OPT_HOST_NAME, CONST_PERSISTENT | CONST_CS);
 	REGISTER_LONG_CONSTANT("LDAP_OPT_ERROR_STRING", LDAP_OPT_ERROR_STRING, CONST_PERSISTENT | CONST_CS);
 #ifdef LDAP_OPT_MATCHED_DN
@@ -1641,7 +1643,9 @@ PHP_FUNCTION(ldap_get_option)
 	case LDAP_OPT_PROTOCOL_VERSION:
 	case LDAP_OPT_ERROR_NUMBER:
 	case LDAP_OPT_REFERRALS:
+#ifdef LDAP_OPT_RESTART
 	case LDAP_OPT_RESTART:
+#endif
 		{
 			int val;
 			if (ldap_get_option(ld->link, opt, &val)) {
@@ -1736,7 +1740,9 @@ PHP_FUNCTION(ldap_set_option)
 		} break;
 		/* options with boolean value */
 	case LDAP_OPT_REFERRALS:
+#ifdef LDAP_OPT_RESTART
 	case LDAP_OPT_RESTART:
+#endif
 		{
 			void *val;
 			convert_to_boolean_ex(newval);