[PATCH] s390x: Add missing grep -q flag to static PIE check

[Florian Weimer]

* Andreas Schwab:

> On Jun 20 2024, Florian Weimer wrote:
>
>> checking for s390-specific static PIE requirements (runtime check)...  0x0000000000000017 (JMPREL)             0x280
>> yes
>
> The output could be redirected to the log file.

What's the blessed Autoconf construct for that?

Thanks,
Florian