MFH: r487154

www/node6: Update 6.14.4_1 -> 6.15.1

This is a security release addressing multiple vulnerabilities. Node.js
6.15.0 addresses the vulnerabilities, and 6.15.1 addresses an issue with
the fix for CVE-2018-12122. Users are recommended to upgrade as soon as
possible.

https://nodejs.org/en/blog/vulnerability/november-2018-security-releases/
https://nodejs.org/en/blog/release/v6.15.0/
https://nodejs.org/en/blog/release/v6.15.1/

Security: 2a86f45a-fc3c-11e8-a414-00155d006b02
Sponsored by: Miles AS

Approved by: ports-secteam (miwi)