Handle special cases for CPU frequency data in /proc/cpuinfo

This adds special cases for:

- loongarch: https://github.com/torvalds/linux/blob/v6.15/arch/loongarch/kernel/proc.c#L42
- s390: https://github.com/torvalds/linux/blob/v6.15/arch/s390/kernel/processor.c#L335

These differ from all the other platforms in the Linux kernel and
weren't matched properly previously. There's an additional value
of "CPU MHz static" available for s390, which is always given
AFTER the dynamic value and thus would override the dynamic value;
we thus ignore the static CPU frequency given for s390 in favour of
the dynamic entry.

Fixes: #1711

Author: BenBE

linux/LinuxMachine.c

@@ -594,6 +594,8 @@ static void scanCPUFrequencyFromCPUinfo(LinuxMachine* this) {
          continue;
       } else if (
          (sscanf(buffer, "cpu MHz : %lf", &frequency) == 1) ||
+         (sscanf(buffer, "CPU MHz : %lf", &frequency) == 1) || // LooooongArch: https://github.com/torvalds/linux/blob/v6.15/arch/loongarch/kernel/proc.c#L42
+         (sscanf(buffer, "cpu MHz dynamic : %lf", &frequency) == 1) || // s390: https://github.com/torvalds/linux/blob/v6.15/arch/s390/kernel/processor.c#L335
          (sscanf(buffer, "clock : %lfMHz", &frequency) == 1)
       ) {
          if (cpuid < 0 || (unsigned int)cpuid > (super->existingCPUs - 1)) {