message: Improve BinaryParagraph::displayname()
diff: @@ -89,14 +89,8 @@ namespace vcpkg
  std::string BinaryParagraph::displayname() const
  {
  - if (this->feature == "")
  - {
  - return this->spec.name() + "[core]:" + this->spec.triplet().to_string();
  - }
  - else
  - {
  - return this->spec.name() + "[" + this->feature + "]:" + this->spec.triplet().to_string();
  - }
  + const auto f = Strings::is_empty(this->feature) ? "core" : this->feature;
  + return Strings::format("%s[%s]:%s", this->spec.name(), f, this->spec.triplet());
  }
  std::string BinaryParagraph::dir() const { return this->spec.dir(); }
  