[Issue 20727] `make -f posix.mak clean` requires a D compiler

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=20727

--- Comment #2 from Dlang Bot <dlang-bot at dlang.rocks> ---
dlang/tools pull request #399 "Work around issue 20727 by passing BOOTSTRAP
when doing clean" was merged into master:

- 895d01aac8cc7247f9573289b0c181de16901047 by Geod24:
  Work around issue 20727 by passing BOOTSTRAP when doing clean

  As explained in issue 20727, AUTO_BOOTSTRAP is not required for 'clean',
  but still triggers the error.

https://github.com/dlang/tools/pull/399

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