www/node4: Update 4.8.4_2 -> 4.8.5

Update to the latest upstream v4.x release to address a remote DoS
vulnerability.

https://nodejs.org/en/blog/vulnerability/oct-2017-dos/
https://nodejs.org/en/blog/release/v4.8.5/

Approved by: robak (mentor)
MFH: 2017Q4
Security: CVE-2017-14919
Differential Revision: https://reviews.freebsd.org/D12783