ls problem due to bad IRIX locale information

[John Saalwaechter]

I built coreutils 5.1.3 because I wanted the latest ls features related to 
formatting the filesize field based on locale settings. (BTW, thanks to Paul 
Eggert for putting this in!)

By setting LC_NUMERIC or LANG to en_US, and setting LS_BLOCK_SIZE to "'1", I 
get the expected filesize output (i.e. 123456789 prints out as 
"123,456,789") on Solaris and Linux.

IRIX refused to work properly (at least IRIX 6.5.9m).  I tracked it down to 
the fact that IRIX has incorrect data for the "grouping" member of the 
"lconv" struct that's returned by localeconv().  All the locales in IRIX 
return a null grouping.  This looks like a known problem in IRIX from back 
to 1996! 
(http://groups.google.com/groups?selm=4hlv4l%244vm%40fido.asd.sgi.com).  The 
grouping for en_US should be {3,0}.  But *all* locales in IRIX return {0}.

This bad data in IRIX locales causes the logic in the group_number() 
function in lib/human.c to fail.  I'm not sure what the philosophy is about 
coding around OS deficiencies, but I at least wanted to get this documented 
on the mailing list for others trying to track down this problem.

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