message: Really fix windows build
  this time I have actually tried that it compiles on windows.
diff: @@ -102,7 +102,7 @@ void ProcessWindowsLog::DisableLog(const char **args, Stream *feedback_strm) {
  log->GetMask().Reset(flag_bits);
  if (flag_bits == 0) {
  g_log_enabled = false;
  - log->SetStream(lldb::StreamSP());
  + log->SetStream(nullptr);
  }
  }
  @@ -110,7 +110,7 @@ void ProcessWindowsLog::DisableLog(const char **args, Stream *feedback_strm) {
  }
  Log *ProcessWindowsLog::EnableLog(
  - std::shared_ptr<llvm::raw_ostream> &log_stream_sp, uint32_t log_options,
  + const std::shared_ptr<llvm::raw_ostream> &log_stream_sp, uint32_t log_options,
  const char **args, Stream *feedback_strm) {
  // Try see if there already is a log - that way we can reuse its settings.
  // We could reuse the log in toto, but we don't know that the stream is the
  