[Issue 20335] posix.mak clean target does not remove all generated files

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=20335

--- Comment #1 from Alan.W.Irwin1234 at gmail.com ---
(In reply to Alan.W.Irwin1234 from comment #0)
> After a build (indirectly via building phobos), install, test, and clean the
> following generated files (as revealed by "git status --ignored") still
> occur in the working directory of the druntime repository:
> 
> ~~~
> Ignored files:
>   (use "git add -f <file>..." to include in what will be committed)
> 
>         druntime.json
> ~~~

Actually, that should read test (of phobos).

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