[PATCH] x86: Don't set Prefer_No_AVX512 for processors with AVX512 and AVX-VNNI

[Florian Weimer]

* H. J. Lu via Libc-alpha:

> Hongtao, Hongyu,  can you find a Rocket Lake to test?

I've found a lab machine with an i7-11700 CPU.  Is there something I
could test for you?

(This could be non-production silicon, though.)

Thanks,
Florian