[patch binutils]: Fix build for cygwin and mingw of binutils tools

[Nick Clifton]

Hi Kai,

> 2009-05-07  Kai Tietz  <kai.tietz@onevision.com>
> 
> 	* winduni.c (iconv_onechar): Add it just if HAVE_ICONV
> 	is defined, but not __CYGWIN__ or _WIN32 is defined.

Approved with the wording change suggested by Dave.

Cheers
   Nick