message: Fix string_view to string assignment
diff: @@ -257,7 +257,7 @@ FileList ParseSourceFileList(absl::string_view file_list_path,
  const std::string& file_list_content) {
  constexpr absl::string_view kIncludeDirPrefix = "+incdir+";
  FileList file_list_out;
  - file_list_out.file_list_path = file_list_path;
  + file_list_out.file_list_path = std::string(file_list_path);
  file_list_out.include_dirs.push_back(".");
  std::string file_path;
  std::istringstream stream(file_list_content);
  