[Rpm-maint] [rpm-software-management/rpm] RFC: Add x86-64 architecture levels (v2-v4) as architectures (PR #2315)

[Fabian Vogt]

> FWIW, I've repeatedly said "no" to attempts to add more assembly into rpm, the only direction for assembly code is _out_. Use the auxiliary vector for determining features, and for things that are not there, I don't think rpm needs to care.

FWICT, the auxiliary vector for HWCAPS is no longer really used and applications (including glibc, gcc runtime code) have to resort to methods like this instead. GCC's `__builtin_cpu_supports` does unfortunately not support all features needed to detect these levels properly.

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