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

[Fabian Vogt]

Just CPUID is not enough and neither is just __builtin_cpu_supports,
so use both.

Fixes: https://github.com/rpm-software-management/rpm/issues/2463

@fweimer Anything else this could possibly be missing?
You can view, comment on, or merge this pull request online at:

  https://github.com/rpm-software-management/rpm/pull/2508

-- Commit Summary --

  * Use __builtin_cpu_supports in x86-64 CPU feature level detection
  * For completeness, make sure CPUID leaf 7 is supported before using it

-- File Changes --

    M lib/rpmrc.c (18)

-- Patch Links --

https://github.com/rpm-software-management/rpm/pull/2508.patch
https://github.com/rpm-software-management/rpm/pull/2508.diff

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