[patch] wrap_langinfo.h

[Benjamin Kosnik]

Thanks brent. This is in, with a few fixups:

1) add these files to the install rules.

2) Instead of using _C_legacy::CODESET, we have to do the ctype_base.h 
trick of bringing the _C_legacy stuff into std, so that non-shadowed 
headers won't balk.

thanks,
benjamin


> 	* include/c_std/bits/wrap_langinfo.h: new file
> 	* include/c_std/langinfo.h: new file
> 	* include/bits/codecvt.h (__enc_trants::__enc_traits()): change
> 	  CODESET to _C_legacy::CODESET.