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

[Fabian Vogt]

> > 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.

Of the one mentioned here:

> AVX + AVX2 + F16C + FMA + LZCNT + MOVBE + BMI + BMI2 + OSXSAVE

F16C, LZCNT, MOVBE and OSXSAVE aren't exposed through `__builtin_cpu_supports`, except by using `x86-64-v3`.

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