message: PackageSpecParseResult const ref bug
diff: @@ -21,7 +21,8 @@ namespace vcpkg
  constexpr bool has_error() const { return m_err != PackageSpecParseResult::SUCCESS; }
  - PackageSpecParseResult error() const { return m_err; }
  + const PackageSpecParseResult& error() const { return m_err; }
  + PackageSpecParseResult& error() { return m_err; }
  CStringView to_string() const { return vcpkg::to_string(m_err); }
  