svr4.h avoidance: rx

[Nick Clifton]

Hi Joseph,

> 2010-12-09  Joseph Myers<joseph@codesourcery.com>
>
> 	* config/rx/rx.h (WCHAR_TYPE, WCHAR_TYPE_SIZE): Define.
> 	* config.gcc (rx-*-elf*): Don't use svr4.h.

Approved - please apply.

Cheers
   Nick