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

[Fabian Vogt]

FTR, the alternative is to use more inline asm... There is an `__xgetbv` intrinsic but apparently that was broken for a while on GCC (https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85684)

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