Revert "Remove MYSQLI_ON_UPDATE_NOW_FLAG"

This reverts commit 4e0ebe4.

Author: kamil-tekiela

ext/mysqli/mysqli.c

@@ -681,6 +681,10 @@ PHP_MINIT_FUNCTION(mysqli)
 	REGISTER_LONG_CONSTANT("MYSQLI_BINARY_FLAG", BINARY_FLAG, CONST_CS | CONST_PERSISTENT);
 	REGISTER_LONG_CONSTANT("MYSQLI_NO_DEFAULT_VALUE_FLAG", NO_DEFAULT_VALUE_FLAG, CONST_CS | CONST_PERSISTENT);
 
+#if MYSQL_VERSION_ID < 60000 || MYSQL_VERSION_ID > 60003 || defined(MYSQLI_USE_MYSQLND)
+	REGISTER_LONG_CONSTANT("MYSQLI_ON_UPDATE_NOW_FLAG", ON_UPDATE_NOW_FLAG, CONST_CS | CONST_PERSISTENT);
+#endif
+
 	REGISTER_LONG_CONSTANT("MYSQLI_TYPE_DECIMAL", FIELD_TYPE_DECIMAL, CONST_CS | CONST_PERSISTENT);
 	REGISTER_LONG_CONSTANT("MYSQLI_TYPE_TINY", FIELD_TYPE_TINY, CONST_CS | CONST_PERSISTENT);
 	REGISTER_LONG_CONSTANT("MYSQLI_TYPE_SHORT", FIELD_TYPE_SHORT, CONST_CS | CONST_PERSISTENT);

ext/mysqli/tests/mysqli_constants.phpt

@@ -125,6 +125,10 @@ mysqli.allow_local_infile=1
         $version = mysqli_get_client_version();
     }
 
+    if (($version > 51122 && $version < 60000) || ($version > 60003) || $IS_MYSQLND) {
+        $expected_constants['MYSQLI_ON_UPDATE_NOW_FLAG'] = true;
+    }
+
     $expected_constants['MYSQLI_CLIENT_SSL_VERIFY_SERVER_CERT'] = true;
     if ($IS_MYSQLND) {
         $expected_constants['MYSQLI_CLIENT_SSL_DONT_VERIFY_SERVER_CERT'] = true;