[PATCH] libctf: use libtool for link test in configure

[Nick Alcock]

On 8 Nov 2022, Indu Bhagat uttered the following:

> Looks like its better to deal with this patch out of the SFrame series.  It has
> been discussed previously in the thread
> https://sourceware.org/pipermail/binutils/2022-November/124102.html
> and seems to be converging.
>
> Testing notes:
>   - regression testing of libctf/ on x86_64-linux-gnu works well.
>
> OK for trunk?

OK, all the tests I can think of have passed with flying colours. Let it
go in!