parallel destroot problematic

[Anders F Björklund]

> I made a partial fix/workaround, that makes destroot.cmd not inherit
> build.cmd but instead use the same "make" definition (with make type)
>
> This is not perfect, since it makes the earlier behaviour of making
> destroot.cmd inherit build.cmd. That would still be the preferred...
> So there should be a better solution, that would separate build.nice
> and build.jobs from build.cmd so that it could still be e.g. "make".

Now fixed (in r36913), so that build.cmd is back to "make" again...

--anders