bug#48021: comp.el cannot be loaded without native compilation

[Glenn Morris]

>>>> Thanks. comp-cstr-test-70 is still failing for me.
>>>
>>> Could you share the invocation you are using? I'm asking cause here on
>>> 449045b2a6 I see this passing.
>
> On CentOS 8.3 with gcc 8.3, I get:
>
> Test comp-cstr-test-70 condition:
>     (ert-test-failed
>      ((should
>        (equal
>        (comp-cstr-test-ts ...)
>        '...))
>       :form
>       (equal
>        (not
>        (member b a))
>        (not
>        (member a b)))
>
> There is an identical failure on the very different system
> https://hydra.nixos.org/build/142153876

Same failure on Debian testing.