68337e55f6
Taking a stab at implementing #14479. Add {Condition,Assert}CPUFeature to `systemd-analyze` & friends. Implement it by executing the CPUID instruction. Add tables for common x86/i386 features. Tested via unit tests + checked that commands such as: ```bash systemd-analyze condition 'AssertCPUFeature = rdrand' ``` Succeed as expected and that commands such as ```bash systemd-analyze condition 'AssertCPUFeature = foobar' ``` Fail as expected. Finally, I have amended the `systemd.unit` manual page with the new condition and the list of all currently supported flags.
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