message: [runtime] Use getloadavg() on NetBSD as well
  Switch NetBSD from reading /proc (which is broken) to getloadavg()
  (which is already used by Darwin).  NetBSD discourages using procfs
  in favor of system API calls.
diff: @@ -2065,7 +2065,7 @@ int __kmp_is_address_mapped(void *addr) {
  #ifdef USE_LOAD_BALANCE
  -#if KMP_OS_DARWIN
  +#if KMP_OS_DARWIN || KMP_OS_NETBSD
  // The function returns the rounded value of the system load average
  // during given time interval which depends on the value of
  