[PATCH] xfstests: rework "dmapi" subtree build mechanism

[Christoph Hellwig]

> I'll add a boilerplate GPL statement in these new files.
> What I used was simply mimicing what was present in the
> other Makefiles.
> 
> In order to avoid re-sending this big patch, may I get
> your signoff/reviewed-by on that plan?

I haven't looked at every detail, but it looks sane and close enough to
the normal build system to me, so:


Reviewed-by: Christoph Hellwig <hch at lst.de>