[Rpm-maint] [rpm-software-management/rpm] Use __builtin_cpu_supports in x86-64 CPU feature level detection (PR #2508)

[Fabian Vogt]

> We don't have any officially supported (or unsupported) compilers other than the C99 requirement. gcc and clang are of course by far the most used ones, so if those are covered by just testing for the availability, the platforms that matter most are covered and everybody else (including ancient gcc/clang) maybe gets a slightly degraded experience but that's life.

Ok. Is it ok to perform this check in the preprocessor (e.g. `#if defined(__has_builtin) && __has_builtin(__builtin_cpu_supports)`) or does it have to be done in CMakeLists? If the latter, it'll be a bit annoying without `check_source_compiles` which is only in 3.19+.

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