C89isms in the test suite

[Sam James]

> On 14 Nov 2022, at 08:19, Florian Weimer <fweimer@redhat.com> wrote:
> 
> * Sam James:
> 
>> Would you be able to backport 6be2672e4ee41c566a9e072088cccca263bab5f7
>> and 885b6660c17fb91980b5682514ef54668e544b02 to the active <13
>> branches?
> 
> Jakub, okay to backport these two (to 12, 11, 10 I presume)?

(Yes please. It's also given me something to poke at as I didn't log
the failure and only noticed when libasan wasn't installed...)

Thanks.
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