www/nginx-devel: update NGINX JavaScript module to 0.6.1.

<ChangeLog>

*) Bugfix: fixed RegExpBuiltinExec() with UTF-8 only regexps.

The bug was introduced in 0.4.2.

*) Bugfix: fixed parsing of export default declaration with

non-assignment expressions.
Thanks to Artem S. Povalyukhin.

</ChangeLog>