code: func runtimeArchitecture() (string, error) {
  	var sysinfo systeminfo
  	syscall.Syscall(procGetSystemInfo.Addr(), 1, uintptr(unsafe.Pointer(&sysinfo)), 0, 0)
  	switch sysinfo.wProcessorArchitecture {
  	case ProcessorArchitecture64, ProcessorArchitectureIA64:
  		return "x86_64", nil
  	case ProcessorArchitecture32:
  		return "i686", nil
  	case ProcessorArchitectureArm:
  		return "arm", nil
  	default:
  		return "", fmt.Errorf("Unknown processor architecture")
  	}
  }
docs: // runtimeArchitecture gets the name of the current architecture (x86, x86_64, …)