bin/150727: diff on UTF-8 text files thinks they are binary - regression from 7.X

[jh at FreeBSD.org]

Synopsis: diff on UTF-8 text files thinks they are binary - regression from 7.X

State-Changed-From-To: feedback->closed
State-Changed-By: jh
State-Changed-When: Mon Sep 20 19:39:42 UTC 2010
State-Changed-Why: 
Submitter's files contained NUL characters. I don't see stable/7 diff(1)
behaving differently.

http://www.freebsd.org/cgi/query-pr.cgi?pr=150727