[Patch] let sessreg build with utmpx exclusively

[Ed Schouten]

Hi folks,

We at FreeBSD very recently gained support for utmpx, while removing
utmp entirely. Our utmpx interface is very compact and should be quite
pleasant to use. There aren't a lot of extensions to POSIX, which is
described here:

	http://www.opengroup.org/onlinepubs/9699919799/basedefs/utmpx.h.html
	http://www.opengroup.org/onlinepubs/9699919799/functions/endutxent.html

It seens the sessreg app is a bit antique and really depends on utmp
being there. I've attached a patch to make it build with FreeBSD HEAD
again.

Greetings,
-- 
 Ed Schouten <ed at 80386.nl>
 WWW: http://80386.nl/
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