[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 #7 from Walter Bright <bugzilla at digitalmars.com> ---
That can't be the problem, as whatever is building druntime for the test suite
works.

The problem is there are no instructions on how to successfully build druntime.

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