AppleSilicon binaries are build without OpenMP support

### 🐛 Describe the bug

```shell
% python -c "import os;import torch;print(os.uname().sysname, os.uname().machine, torch.__version__, torch.backends.openmp.is_available())"
Darwin arm64 2.1.1 False
```

### Versions

2.1.x, nightly

cc @ezyang @gchanan @zou3519 @kadeng