langinfo.h on glibc-2.1.94

[Benjamin Kosnik]

sorry about the huge delay on this one.

> | shadow nl_langinfo.h much the same way that pthread.h was shadowed.
> 
> er, I don't have a nl_langinfo.h file on my box... If you mean 
> langinfo.h, how do we deal with the huge enum{} it contains? 
> a using ::_C_legacy::VAL for each VAL in the enum, or do we
> just use ::_C_legacy::VAL, i.e., ::_C_legacy::CODESET where CODESET
> is currently used in bits/codecvt.h (and any other references to
> those enum'd values)  I like the latter option. 
> 

do this like the stuff in ctype_base. Just bring in the enums (ie your
later option)

> do these files need shadowing?
>   nl_types.h
>   xlocale.h
>   (anything that we include (in)?directly).h

just do nl_types.h right now.