*/*: update NGINX JavaScript 0.7.11 -> 0.7.12

<ChangeLog>

nginx modules:
*) Bugfix: fixed Headers() constructor in Fetch API.

Core:
*) Feature: added Hash.copy() method in "crypto" module.
*) Feature: added "zlib" module.
*) Improvement: added support for export {name as default}

statement.

*) Bugfix: fixed Number constructor according to the spec.

</ChangeLog>