[Issue 14274] tools/update.sh must install and use dmd 2.066.1 if not present

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=14274

--- Comment #4 from Mathias LANG <pro.mathias.lang at gmail.com> ---
Right... The underlying bug is: https://issues.dlang.org/show_bug.cgi?id=20727
`setup.sh` doesn't pass `AUTO_BOOTSTRAP` when doing clean.
I submitted a workaround here: https://github.com/dlang/tools/pull/399

I'd say there is no need to re-open this issue because the bug it is describing
(lack of bootstrapping) has been fixed, and the fix is correct, it's the DMD
makefile that isn't.

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