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Summary:
closes https://github.com/pytorch/audio/issues/2420

Pull Request resolved: https://github.com/pytorch/audio/pull/2479

Reviewed By: carolineechen

Differential Revision: D37142717

Pulled By: mthrok

fbshipit-source-id: c3d4cc1435a74dfa6992112590c988c2903511a8

Summary:
Remove the code related to libmad, which had been disabled in https://github.com/pytorch/audio/issues/2354

In https://github.com/pytorch/audio/issues/2419, we mp3 decoding to ffmpeg. But CI tests were still using libmad.
This commit completely removes libmad from torchaudio.

This is BC-breaking change as `apply_sox_effects_file` function cannot handle MP3, and it cannot fallback to ffmpeg.
The workaround for this is to use `torchaudio.load` then `apply_sox_effects_tensor`.

Pull Request resolved: https://github.com/pytorch/audio/pull/2428

Reviewed By: carolineechen

Differential Revision: D36851805

Pulled By: mthrok

fbshipit-source-id: f98795c59a1ac61cef511f2bbeac37f7c3c69d55

Summary:
This commit
1. Updates the config.guess and config.sub files and
2. applies them to all the third party libraries that use them.

This resolves the following build failure on M1 mac with newer SDK.

On MacBookPro with M1 chip, with the recent OS update, something
about the development environment has been changed (probably newer
version of XCode) and the build stopeed working with the following
errors from third party dependencies.

```
checking build system type... Invalid configuration ‘arm64-apple-darwin20.0.0': machine ‘arm64-apple' not recognized
```

note: config files are taken from https://www.gnu.org/software/gettext/manual/html_node/config_002eguess.html

Pull Request resolved: https://github.com/pytorch/audio/pull/2307

Reviewed By: nateanl

Differential Revision: D35318273

Pulled By: mthrok

fbshipit-source-id: 746ac51dd1816767aa78b88445f76a29acfd29e8