check_cpu - Detects the CPU type. Allegro game programming library.
       #include <allegro.h>
       void check_cpu();
       Detects the CPU type, setting the following global variables. You don't
       normally need to call this, because allegro_init() will do it for  you.
       cpu_vendor(3alleg),        cpu_family(3alleg),       cpu_model(3alleg),
       cpu_capabilities(3alleg), allegro_init(3alleg)