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Summary:
Recent CircleCI migration https://github.com/pytorch/audio/pull/2529
silently bumped the minimum supported macOS version to 11.

PyTorch still supports 10.9 and the ecosystem still uses 10.9.
Issue: https://github.com/pytorch/audio/issues/2536

This commit sets MACOSX_DEPLOYMENT_TARGET=10.9, so that binary
distribution are compatible on macOS=10.9.

Pull Request resolved: https://github.com/pytorch/audio/pull/2546

Reviewed By: atalman

Differential Revision: D37854586

Pulled By: mthrok

fbshipit-source-id: a43986ae4de9ef51a4261e0f9fe58e88b4b72148