message: Introduce keep_if function
diff: @@ -21,4 +21,10 @@ namespace vcpkg::Util
  return ret;
  }
  +
  + template<class Container, class Pred>
  + void keep_if(Container& cont, Pred pred)
  + {
  + cont.erase(std::remove_if(cont.begin(), cont.end(), pred), cont.end());
  + }
  }
  \ No newline at end of file
  