Test suite failures with GCC 11 in header checks

[Florian Weimer]

* Florian Weimer:

> The test suite currently runs header checks with -D_FORTIFY_SOURCE=3
> even if the compiler does not support it (such as GCC 11), leading to
> failures.
>
> Has this already been discussed?  Should be resolved before the release?

It's a regression introduced yesterday:

commit 30379efad117b85cc56a255cac628d0ad745bfe3
Author: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Date:   Wed Jul 19 11:37:01 2023 -0300

    scripts: Add fortify checks on installed headers
    
    The _FORTIFY_SOURCE is used as default by some system compilers,
    and there is no way to check if some fortify extension does not
    trigger any conformance issue.
    
    Checked on x86_64-linux-gnu.
    
    Reviewed-by: Carlos O'Donell <carlos@redhat.com>

Thanks,
Florian