[patch mingw]: Add multilib support for i?86-w64-mingw32 target

[Joseph S. Myers]

On Sun, 13 Sep 2009, Kai Tietz wrote:

> See for this comment in hwint.h of gcc.
> 
> "With a sane ABI, 'long' is the largest efficient host integer type.
> Thus, we use that unless we have to use 'long long' or '__int64'
> because we're targeting a 64-bit machine from a 32-bit host.  "

That comment is about the setting of HOST_WIDE_INT.  The change I think is 
wrong is that relating to HOST_WIDEST_FAST_INT, to which that comment is 
irrelevant.

-- 
Joseph S. Myers
joseph@codesourcery.com