tools: Update cgltf.h to e8291d28f2e8bbc5ba7a6b19116ec811ea445f4f
tools: Update cgltf.h to e8291d28f2e8bbc5ba7a6b19116ec811ea445f4f

This adds support for sparse data through cgltf_accessor_unpack_floats.

zeux/meshoptimizer,zeux/meshoptimizer,zeux/meshoptimizer