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

[d-bugmail at puremagic.com]

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

          Issue ID: 20335
           Summary: posix.mak clean target does not remove all generated
                    files
           Product: D
           Version: D2
          Hardware: x86_64
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P1
         Component: druntime
          Assignee: nobody at puremagic.com
          Reporter: Alan.W.Irwin1234 at gmail.com

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
~~~

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