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

[Dave Korn]

Kai Tietz wrote:

> the used hwint and the use_long_long_for_widest_fast_int. I added to
> cygwin host configuration in config.host the
> use_long_long_for_widest_fast_int, too. If there are objections about
> this please let me know (I'll remove it). But as far as I could see,
> it should cause any penalties for cygwin.

  Heh :) amusing place to omit the word "not"!  Anyway that should be fine, if
any problems do crop up I'll notice sometime during next week when I update
all my sandboxes to head, but I can't see how anything would go wrong.

    cheers,
      DaveK