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

[Martin Liška]

> 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.

What feature do you miss? Note that using `__builtin_cpu_supports` would be much cleaner code and it's supported also by LLVM.

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