docs/185810: [patch][porters-handbook]: add needed whitespace in Makefile for port

[wblock at FreeBSD.org]

Synopsis: [patch][porters-handbook]: add needed whitespace in Makefile for port

Responsible-Changed-From-To: freebsd-doc->wblock
Responsible-Changed-By: wblock
Responsible-Changed-When: Wed Jan 15 20:05:02 UTC 2014
Responsible-Changed-Why: 
Take.

http://www.freebsd.org/cgi/query-pr.cgi?pr=185810