CPU: Remove unneeded test program bundled with runtime CPU detection

The 'main' function got there by accident and was not spotted
earlier because the driver itself is a shared library.
Signed-off-by: Siarhei Siamashka <siarhei.siamashka@gmail.com>

src/cpuinfo.c

@@ -187,10 +187,3 @@ void cpuinfo_close(cpuinfo_t *cpuinfo)
     free(cpuinfo->processor_name);
     free(cpuinfo);
 }
-
-int main()
-{
-    cpuinfo_t *cpuinfo = cpuinfo_init();
-    printf("%s %d\n", cpuinfo->processor_name, cpuinfo->has_arm_neon);
-    return 0;
-}