[PATCH] libstdc++: implement locale support for AIX

[CHIGOT, CLEMENT]

Hi guys, 

> Those are even worse than the Solaris ones
Yes, but many of them aren't related to my patch. 
And the ones related will have to wait for futures patches.
Most of them are just details of AIX being not standard, or 
I don't have a single idea about what's wrong. 

> I haven't fired up my FreeBSD VM in a long time, but I expect Gerald
> will easily be able to provide more details.
I see that Gerald have been put in CC. 
Gerald would it be possible to know why most of the 22_locale tests 
are failing on FreeBSD and if my patch provide worst or better 
results than now ?