message: Fix OIIO disabled compile error by wrapping code in #ifdef
diff: @@ -57,6 +57,7 @@ namespace ospray::sg {
  }
  +#ifdef USE_OPENIMAGEIO
  template <typename T>
  void generateOIIOTex(std::vector<T> &imageData,
  const size_t stride,
  @@ -210,6 +211,7 @@ namespace ospray::sg {
  #endif
  }
  }
  +#endif
  template <typename T>
  void generatePPMTex(std::vector<T> &data,
  