[PATCH toplevel] libctf: new testsuite

[Nick Alcock]

On 5 Jan 2021, Alan Modra via Binutils told this:

> It doesn't apply due to gcc missing binutils 87279e3cef5b2c5 changes
> too.  I could fix that easily enough but I'm going to ask that you
> post a combined patch to bring the gcc repo up to date with any libctf
> changes.

Oops! That never occurred to me, but of course all the earlier stuff is
probably missing too. Will come up with one once I've properly woken up.

(Sorry, I really should have tried to apply it :( )

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