CPU (NetBSD): properly support PowerPC (#1802)

Some devices store their CPU name in hw.model, so check that as well
before giving up.  Tested on NetBSD 10.1 evbppc/wii, and allows it to
detect the CPU as "750 (Revision 2.0)".

---------

Co-authored-by: Carter Li <[email protected]>

Author: techflashYT

src/detection/cpu/cpu_nbsd.c

@@ -51,7 +51,8 @@ const char* ffDetectCPUImpl(const FFCPUOptions* options, FFCPUResult* cpu)
 {
     if (ffSysctlGetString("machdep.cpu_brand", &cpu->name) != NULL &&
         ffSysctlGetString("machdep.dmi.processor-version", &cpu->name) != NULL &&
-        ffSysctlGetString("hw.cpu0.name", &cpu->name) != NULL)
+        ffSysctlGetString("hw.cpu0.name", &cpu->name) != NULL &&
+        ffSysctlGetString("hw.model", &cpu->name) != NULL)
     {
         ffStrbufSetS(&cpu->name, "Unknown CPU");
     }