[Issue 23193] druntime/win32.mak, win64.mak, posix.mak contain no instructions for how to build druntime

[d-bugmail at puremagic.com]

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

--- Comment #9 from Iain Buclaw <ibuclaw at gdcproject.org> ---
(In reply to Walter Bright from comment #7)
> That can't be the problem, as whatever is building druntime for the test
> suite works.
I doubt running the druntime unit-tests is dependent on all iles being copied
to the import directory.

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