message: indexcodec: Fix compilation warnings
diff: @@ -176,6 +176,7 @@ size_t meshopt_encodeIndexBuffer(unsigned char* buffer, size_t buffer_size, cons
  }
  assert(data <= buffer + buffer_size);
  + (void)buffer_size;
  return data - buffer;
  }
  @@ -187,7 +188,7 @@ size_t meshopt_encodeIndexBufferBound(size_t index_count, size_t vertex_count)
  // compute number of bits required for each index
  unsigned int vertex_bits = 1;
  - while (vertex_bits < 32 && vertex_count > (1 << vertex_bits))
  + while (vertex_bits < 32 && vertex_count > (1u << vertex_bits))
  vertex_bits++;
  // worst-case encoding is 2 header bytes + 3 varint-7 encoded indices
  @@ -282,4 +283,5 @@ void meshopt_decodeIndexBuffer(unsigned int* destination, size_t index_count, co
  }
  assert(data == buffer + buffer_size);
  + (void)buffer_size;
  }
  