[Issue 23193] druntime/win32.mak contains no instructions for how to build druntime

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=23193

--- Comment #3 from Iain Buclaw <ibuclaw at gdcproject.org> ---
(In reply to Walter Bright from comment #1)
> For example, how do I set the bootstrap dmd compiler?
> 
> What commands do I pass to make?
> 
> What make.exe is run?
where make.exe

If you don't know your own toolchain, we're all doomed. :-)

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