some libunistring 1.0 tests are core dumping on github build

[Jon Turney]

On 19/10/2022 15:55, Erwin Waterlander wrote:
> Hi,
>   
> I uploaded a new cyport file for libunistring 1.0. I got a failed build, because several tests core dumped. This does not happen when I run the tests on my PC. What to do next?
>   
> See https://github.com/cygwin/scallywag/actions/runs/3252280207

Interesting.

The builddir artefact should contain the entire build directory, 
including any .stackdump files generated, which might give some insight.