WIN-14: add #undef STRICT to win32-threads.cc

[Bryce McKinlay]

Adam Megacz wrote:

>OK to commit?
>
>  - a
>
>2002-02-04  Adam Megacz <adam@xwt.org>
>
>        * win32-threads.cc: #undef STRICT after gc.h inclusion
>

OK, but can you add a comment explaining why its there?

Bryce.