message: call GetAdaptersInfo will crash
  x86_64-pc-windows-msvc win7
  call GetAdaptersInfo winapi will  crash,this change will fix this error.
diff: @@ -275,12 +275,10 @@ pub fn interfaces() -> Vec<NetworkInterface> {
  winpcap::GetAdaptersInfo(&mut tmp, &mut adapters_size);
  }
  - let vec_size = adapters_size / mem::size_of::<winpcap::IP_ADAPTER_INFO>() as u32;
  -
  + let mut vec_size = adapters_size / mem::size_of::<winpcap::IP_ADAPTER_INFO>() as u32;
  if adapters_size % mem::size_of::<winpcap::IP_ADAPTER_INFO>() as u32 != 0 {
  vec_size += 1;
  }
  -
  let mut adapters = Vec::with_capacity(vec_size as usize);
  // FIXME [windows] Check return code
  