www/node5: 5.11.1 -> 5.12.0

This is a security release, see
https://nodejs.org/en/blog/vulnerability/june-2016-security-releases
for details on patched vulnerabilities.

• buffer o backport allocUnsafeSlow o ignore negative allocation lengths
• deps: backport 3a9bfec from v8 upstream o Fixes a Buffer overflow vulnerability discovered in v8. More details can be found in the CVE (CVE-2016-1699).

PR: 210519
Changes: https://nodejs.org/en/blog/release/v5.12.0/
Submitted by: Bradley T. Hughes <bradleythughes@fastmail.fm> (maintainer)