message: runtime: don't attempt to read from /proc on macOS
diff: @@ -88,6 +88,10 @@ Runtime::Runtime() {
  }
  void Runtime::initMaxMapCount() {
  +#ifndef __linux__
  + return;
  +#endif
  +
  auto fd = open("/proc/sys/vm/max_map_count", O_RDONLY | O_CLOEXEC);
  if (unlikely(fd < 0)) {
  mesh::debug("initMaxMapCount: no proc file");
  