[Issue 21139] dhsell tests fail locally

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=21139

--- Comment #2 from Basile-z <b2.temp at gmx.com> ---
mmh no and this solves the problem, but this problem comes often. Before I very
rarely had to make clean (eventually sometimes after ^C, there could remain
some bad objects, but otherwise never).

The dependency on phobos is to blame here, as it has no stable ABI. Maybe that
dshell objects should never be cached for less surprises.

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