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

[Fangrui Song]

> Hmm, I see and you are right. Well, I hope you can use `__builtin_cpu_supports("x86-64-v3")` in the future once LLVM implements it. It's very unfortunate we've added a useful builti-in, but projects are still forced to parse cpuinfo itself :/

I created https://reviews.llvm.org/D158811 to implement `__builtin_cpu_supports("x86-64")` (and v2 v3 v4). It will hopefully be part of Clang 18.

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