[patch] Don't detect libiconv/libcharset on Windows to avoid changing GHCs build behavior on windows with newer mingw installs

[Ian Lynagh]

On Fri, Sep 16, 2011 at 07:10:13PM -0400, Bill Tutt wrote:
> 
> If iconv is detected vector-0.8 fails to build because ghc can't find
> iconv.dll.

Patch applied, thanks!


Thanks
Ian