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

[CHIGOT, CLEMENT]

Hi everyone, 

I've reworked the patch to merged dragonfly and AIX
models into the new one named "ieee_1003.1-2008". 
It seems okay on the AIX part but if someone can test
on Dragonfly and Freebsd I would be glad. Configure 
needs to be regenerated, first.

For now, I've used #ifdef inside the code for the few
differences. There are less than I thought. So, it seems 
okay to me. 
However, I haven't changed all the (locale_t) casts 
made on Dragonfly when passing a locale object to
a syscall. On AIX, this is transparent, __c_locale being 
locale_t. 

I haven't updated tests failing on AIX yet. 
And I don't know for the Changelog/Patch, how renamed 
files must be handled ? I've retrieved my git commit with 
"git format-patch --no-renames" and thus the Changelog 
is made of "Removed" and "New File". Is it okay or is there 
anything special to add ? I didn't find the answer quickly. 

Thanks, 
Clément
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