Pullup ticket #5185 (second part) - requested by wiz
security/gnutls: build fix

Revisions pulled up:
- security/gnutls/buildlink3.mk                                1.32

---
  Module Name: pkgsrc
  Committed By: wiz
  Date: Wed Jan 11 17:06:52 UTC 2017

  Modified Files:
  pkgsrc/security/gnutls: buildlink3.mk

  Log Message:
  Add libunistring to bl3.mk, it's linked into libgnutls{,xx}.so.

  PR 51830

(bsiegert)