message: verilog: analysis: verilog_project: Fixed AddIncludePath to add only new paths
  To avoid duplicates in include_paths_ in VerilogProject,
  the commit checks if the given include path does not exist yet
diff: @@ -306,7 +306,10 @@ class VerilogProject {
  // Adds include directory to the project
  void AddIncludePath(absl::string_view includepath) {
  - include_paths_.push_back({includepath.begin(), includepath.end()});
  + std::string path = {includepath.begin(), includepath.end()};
  + if (std::find(include_paths_.begin(), include_paths_.end(), path) ==
  + include_paths_.end())
  + include_paths_.push_back(path);
  }
  private:
  