Spyc is not loaded correctly (ext_tables.php) if Spyc isn't installed via composer

[AndreasA]

If \Spyc is not installed via composer or doesn't exist during ext_tables.php loading, it isn't loaded correctly as:

   /**
             * Manually load Spy YAML parser
             */
            if (!class_exists('\Spyc')) {
                require_once($extensionPath . '/Resources/Private/Spyc/Spyc.php');
            }

the path doesn't exist in that form.

The correct path would be:

   /**
             * Manually load Spy YAML parser
             */
            if (!class_exists('\Spyc')) {
                          require_once($extensionPath . 'Resources/Private/Libraries/Spyc/Spyc.php');
            }