--show-system-info fails on Apple Silicon M1

[boegel]

Different system queries via sysctl are broken on Apple Silicon.

Known issues:

• "sysctl -n hw.cpufrequency_max" returns empty result, used in get_cpu_speed
  • see also cpuCurrentSpeed() broken on M1 sebhildebrandt/systeminformation#564)
• machdep.cpu.vendor (used in get_cpu_vendor) and machdep.cpu.extfeatures (used in get_cpu_features) are not supported, triggers sysctl: unknown oid error

[terjekv]

powermetrics gives some useful information, but requires to be run as root..

namtso:~ root# powermetrics -n1 -ftext | grep frequen
E-Cluster HW active frequency: 1797 MHz
CPU 0 frequency: 1826 MHz
CPU 1 frequency: 1825 MHz
P0-Cluster HW active frequency: 902 MHz
CPU 2 frequency: 1070 MHz
CPU 3 frequency: 1042 MHz
CPU 4 frequency: 1032 MHz
CPU 5 frequency: 1030 MHz
P1-Cluster HW active frequency: 714 MHz
CPU 6 frequency: 1037 MHz
CPU 7 frequency: 998 MHz
CPU 8 frequency: 1009 MHz
CPU 9 frequency: 1020 MHz
GPU active frequency: 72 MHz
GPU requested frequency: (389 MHz:  15% 486 MHz: .86% 648 MHz: .52% 778 MHz: .52% 972 MHz: .20% 1296 MHz: .09%)