*/*: update NGINX JavaScript 0.7.10 -> 0.7.11

While I'm here drop pcre flavor support for lang/njs.

Bump PORTREVISION for www/nginx-devel.

<ChangeLog>
nginx modules:

*) Bugfix: added missed linking with libxml2 for the dynamic module.

The bug was introduced in 0.7.10.

Core:

*) Feature: added XMLNode API to modify XML documents.

*) Change: removed XML_PARSE_DTDVALID during parsing of XML document

due to security implications. The issue was introduced
in 0.7.10. When XML_PARSE_DTDVALID is enabled, libxml2 parses and
executes external entities present inside an XML document.

*) Bugfix: fixed the detection of await in arguments.

*) Bugfix: fixed Error() instance dumping when "name" prop is not

primitive.

*) Bugfix: fixed array instance with a getter property dumping.

*) Bugfix: fixed njs_object_property() with NJS_WHITEOUT properties.

*) Bugfix: fixed func instance dumping with "name" as getter.

*) Bugfix: fixed attaching of a stack to an error object.

*) Bugfix: fixed String.prototype.replace() with replacement containing

"$'", "$`".

</ChangeLog>