message: indexgenerator: Assert that stream_count > 0
  Passing no streams doesn't make sense and wouldn't really work for
  either algorithm that uses streams.
diff: @@ -176,7 +176,7 @@ size_t meshopt_generateVertexRemapMulti(unsigned int* destination, const unsigne
  assert(indices || index_count == vertex_count);
  assert(index_count % 3 == 0);
  - assert(stream_count <= 16);
  + assert(stream_count > 0 && stream_count <= 16);
  for (size_t i = 0; i < stream_count; ++i)
  {
  @@ -308,7 +308,7 @@ void meshopt_generateShadowIndexBufferMulti(unsigned int* destination, const uns
  assert(indices);
  assert(index_count % 3 == 0);
  - assert(stream_count <= 16);
  + assert(stream_count > 0 && stream_count <= 16);
  for (size_t i = 0; i < stream_count; ++i)
  {
  