Update build_wheels.py

The attached file here fixes an issue using HuggingFace datasets requiring `soundfile` on aarch64.

I compiled on this branch (bastibe/aarchh64-build) using `linux_build.sh` on Grace Hopper, which requires aarch64. This generated libsndfile.so which I renamed to libsndfile_aarch64.so to match the others

Then, in [this line ](https://github.com/bastibe/python-soundfile/blob/master/build_wheels.py#L6)I added `'aarch64'` and built the whl as suggested `python setup.py bdist_wheel` followed by installing the `whl` with `pip install dist/soundfile-0.12.1-py2.py3-none-manylinux_2_17_aarch64.whl`

This file should just be added to the repo along with the others.

build_wheels.py

@@ -3,7 +3,7 @@
 
 architectures = dict(darwin=['x86_64', 'arm64'],
                      win32=['32bit', '64bit'],
-                     linux=['x86_64'],
+                     linux=['x86_64', 'aarch64'],
                      noplatform='noarch')
 
 def cleanup():