[RFC] setup: allow building with i686-w64-mingw32

[Yaakov (Cygwin/X)]

Fedora has switched from the i686-pc-mingw32 toolchain to the 
{i686,x86_64}-w64-mingw32 toolchains in F17.  This means that setup 
cannot currently be built on F17.

The attached draft patch fixes most of the issues with the build.  (I 
just added the necessary mingw64-i686-* libraries to Ports.)  ntdll.h 
needs some more work though; perhaps JonY could provide some input?

Also, if we still want to support the i686-pc-mingw32 toolchain, the 
bootstrap.sh chunk should probably be expanded to use whichever 
toolchain is available.  That is moot, however, until it actually 
compiles with w64.


Yaakov
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