message: xatlas: fix read-from-freed.
  This fix has also been been submitted to the upstream repo.
diff: @@ -1707,6 +1707,10 @@ public:
  seed(s);
  }
  + // The "next" pointer makes the default copy constructor unsafe, so delete it.
  + MTRand(const MTRand&) = delete;
  + MTRand& operator=(const MTRand&) = delete;
  +
  /// Provide a new seed.
  void seed( uint32_t s )
  {
  @@ -7016,7 +7020,6 @@ struct AtlasPacker
  XA_PRINT(" Estimating texelsPerUnit as %g\n", m_texelsPerUnit);
  }
  }
  - m_rand = MTRand();
  Array<float> chartOrderArray;
  chartOrderArray.resize(chartCount);
  Array<Vector2> chartExtents;
  