[Issue 18413] Document how to setup/run DMD test suite on WINDOWS

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=18413

--- Comment #4 from Jonathan Marler <johnnymarler at gmail.com> ---
Building DMD on linux with WINE is a good use case.  However, that has a
different set of problems than building on windows directly.  Namely, how to
build/install GNUmake and BASH.

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