message: Fix another error in old toolchains
  Summary: Pull Request resolved:
diff: @@ -51,7 +51,7 @@ class DexStructure {
  bool empty() const { return m_classes_iterators.empty(); }
  DexClasses get_classes() const {
  - return std::vector(m_classes.begin(), m_classes.end());
  + return DexClasses(m_classes.begin(), m_classes.end());
  }
  /**
  