[LTP] [RFC] Reduce LICENCE/COPYING files

[Li Wang]

> > > I suppose it's safe to keep only single licence in testcases/open_posix_testsuite/,
> > > but could we keep only COPYING in the root directory and delete the rest?
> > > Or keep COPYING and testcases/open_posix_testsuite/COPYING only?
>
> > Do we even need these files? Isn't SPDX identifier enough these days?
> It be nice we don't need it, but not sure. Looking into kernel tree, there is
> LICENSES folder [1] and they describe how they use SPDX [2]:

My perspective is to stay on the safe side, keep one in the LTP root
dir and one in the subproject(e.g. open_posix).

The general files go with the SPDX identifier header.

-- 
Regards,
Li Wang