* features_cpu: Return model name on non-x86 Linux platforms
Extract model name from /proc/cpuinfo.
* platform/unix: Rework identification of classic Arm CPUs
Identify pre-ARMv7 CPUs based on the machine hardware name starting with
"arm" instead of matching every individual variant. This will then
include the ARM926EJ-S which has armv5tejl as its machine hardware name.