[Bug libstdc++/100444] std::random_device isn't random on AMD

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100444

--- Comment #13 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Edward Cree from comment #12)
> Stdlib must be looking at cpuid
> directly rather than using anything the kernel can mediate?)

Correct.