patches: Added 02-php5.4.diff -- use ob_end_flush() in favor of ob_end_clean()

… if the buffer contains any data to make sure the rendered page is actually
displayed (PHP 5.4 handles end_clean() a bit different than previous
versions).

Thanks to Bernhard Schmidt for reporting this and Jörg Linge for tracking down
to problem.
Closes: #665197