[v3] libstdc++/18571

[Benjamin Kosnik]

this is the second of four parts. 

This a consolidation of the codecvt specialization code, moving it to an
optional extension. Because of this, it is no longer a somewhat
ill-fitting part of the current locale configuration. 

tested x86/linux

-benjamin
-------------- next part --------------
An embedded and charset-unspecified text was scrubbed...
Name: p.20050106-2
URL: <http://gcc.gnu.org/pipermail/libstdc++/attachments/20050106/4a5324b5/attachment.ksh>