Log Message:
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