message: clusterizer: Fix build warnings
  Fixes MSVC type conversion and clang 'unused variable' warnings.
diff: @@ -248,19 +248,19 @@ static bool appendMeshlet(meshopt_Meshlet& meshlet, unsigned int a, unsigned int
  if (av == 0xff)
  {
  - av = meshlet.vertex_count;
  + av = (unsigned char)meshlet.vertex_count;
  meshlet_vertices[meshlet.vertex_offset + meshlet.vertex_count++] = a;
  }
  if (bv == 0xff)
  {
  - bv = meshlet.vertex_count;
  + bv = (unsigned char)meshlet.vertex_count;
  meshlet_vertices[meshlet.vertex_offset + meshlet.vertex_count++] = b;
  }
  if (cv == 0xff)
  {
  - cv = meshlet.vertex_count;
  + cv = (unsigned char)meshlet.vertex_count;
  meshlet_vertices[meshlet.vertex_offset + meshlet.vertex_count++] = c;
  }
  @@ -436,6 +436,9 @@ size_t meshopt_buildMeshletsBound(size_t index_count, size_t max_vertices, size_
  assert(max_triangles >= 1 && max_triangles <= kMeshletMaxTriangles);
  assert(max_triangles % 4 == 0); // ensures the caller will compute output space properly as index data is 4b aligned
  + (void)kMeshletMaxVertices;
  + (void)kMeshletMaxTriangles;
  +
  // meshlet construction is limited by max vertices and max triangles per meshlet
  // the worst case is that the input is an unindexed stream since this equally stresses both limits
  // note that we assume that in the worst case, we leave 2 vertices unpacked in each meshlet - if we have space for 3 we can pack any triangle
  