message: gltfio: Disable file formats that we do not need.
  This only removes 40k but at least it is easy.
diff: * limitations under the License.
  */
  +#define STBI_NO_BMP
  +#define STBI_NO_PSD
  +#define STBI_NO_TGA
  +#define STBI_NO_GIF
  +#define STBI_NO_HDR
  +#define STBI_NO_PIC
  +#define STBI_NO_PNM
  +
  #define STB_IMAGE_IMPLEMENTATION
  #include <stb_image.h>
  