utmp fix for mips64 uClibc systems

[Mike Frysinger]

On Monday 24 September 2012 15:13:49 Cathey, Jim wrote:
> This is a uLibc fault.  A common idiom,
> from way back, is:
> 
> 	close(creat(...));
> 
> Close is supposed to be able to survive being
> given a negative number.

yes, if close(-1) is crashing, fix uClibc.  bloating busybox to work around 
buggy C lib like this is not good.
-mike
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