message: extern: Update cgltf to fix memory leaks
  This isn't yet fixed upstream, but there's a PR:
diff: @@ -1014,6 +1014,7 @@ static void cgltf_combine_paths(char* path, const char* base, const char* uri)
  static cgltf_result cgltf_load_buffer_file(const cgltf_options* options, cgltf_size size, const char* uri, const char* gltf_path, void** out_data)
  {
  void* (*memory_alloc)(void*, cgltf_size) = options->memory.alloc ? options->memory.alloc : &cgltf_default_alloc;
  + void (*memory_free)(void*, void*) = options->memory.free ? options->memory.free : &cgltf_default_free;
  cgltf_result (*file_read)(const struct cgltf_memory_options*, const struct cgltf_file_options*, const char*, cgltf_size*, void**) = options->file.read ? options->file.read : &cgltf_default_file_read;
  char* path = (char*)memory_alloc(options->memory.user_data, strlen(uri) + strlen(gltf_path) + 1);
  @@ -1026,14 +1027,12 @@ static cgltf_result cgltf_load_buffer_file(const cgltf_options* options, cgltf_s
  void* file_data = NULL;
  cgltf_result result = file_read(&options->memory, &options->file, path, &size, &file_data);
  - if (result != cgltf_result_success)
  - {
  - return result;
  - }
  - *out_data = file_data;
  + memory_free(options->memory.user_data, path);
  - return cgltf_result_success;
  + *out_data = (result == cgltf_result_success) ? file_data : NULL;
  +
  + return result;
  }
  cgltf_result cgltf_load_buffer_base64(const cgltf_options* options, cgltf_size size, const char* base64, void** out_data)
  @@ -1477,6 +1476,16 @@ void cgltf_free(cgltf_data* data)
  }
  data->memory.free(data->memory.user_data, data->meshes[i].primitives[j].targets);
  +
  + if (data->meshes[i].primitives[j].has_draco_mesh_compression)
  + {
  + for (cgltf_size k = 0; k < data->meshes[i].primitives[j].draco_mesh_compression.attributes_count; ++k)
  + {
  + data->memory.free(data->memory.user_data, data->meshes[i].primitives[j].draco_mesh_compression.attributes[k].name);
  + }
  +
  + data->memory.free(data->memory.user_data, data->meshes[i].primitives[j].draco_mesh_compression.attributes);
  + }
  }
  data->memory.free(data->memory.user_data, data->meshes[i].primitives);
  @@ -4710,7 +4719,8 @@ static int cgltf_fixup_pointers(cgltf_data* data)
  }
  }
  - if (data->meshes[i].primitives[j].has_draco_mesh_compression) {
  + if (data->meshes[i].primitives[j].has_draco_mesh_compression)
  + {
  CGLTF_PTRFIXUP_REQ(data->meshes[i].primitives[j].draco_mesh_compression.buffer_view, data->buffer_views, data->buffer_views_count);
  for (cgltf_size m = 0; m < data->meshes[i].primitives[j].draco_mesh_compression.attributes_count; ++m)
  {
  