vfprintf multibyte

[Artem B. Bityuckiy]

Hello.

I offer some optimization.

Look at CVS-Newlib newlib/libc/stdio/vfprintf.c line 553 for example. 
mbtowc call is used. This is needed to support multibyte format string. 
But usually in newlib such things are placed in #ifdef MB_CAPABLE/#endif 
pair. And this is right because it excludes junk code if Newlib is 
configured without multibyte support (if MB_CAPABLE isn't defined then 
the only multibyte is US_ASCII or, possibly, other 1 byte encoding like iso-8859-x).

I offer the patch that excludes mbtowc calls if newlib shouldn't support 
multibyte.

Please, see, check, comment.

-- 
Best Regards,
Artem B. Bityuckiy,
St.-Petersburg, Russia.


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