xwininfo: Changes to 'master'

[Alan Coopersmith]

Jeremy Huddleston wrote:
> This introduces a build failure on darwin.  You need to provide strnlen (look at xlsclients)

Sorry, I'm so used to Solaris being the last platform to get new
functions in libc() that I didn't think to check if other platforms
had it since we did.

-- 
	-Alan Coopersmith-        alan.coopersmith at oracle.com
	 Oracle Solaris Platform Engineering: X Window System