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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

Summary:
Currently, macOS CI jobs install `pkg-config` and `wget` with `brew`.
This is problematic as brew takes a long time with auto-update, and disabling the auto-update is not an ideal solution.
Conda also distributes these packages, so switching to conda.

Example issues with brew installation.
https://app.circleci.com/pipelines/github/pytorch/audio/7825/workflows/53965bcf-6ddf-4e42-ad52-83fd1bbab717

This commit removes the use of `brew` by
1. Replacing the use of `wget` with `curl` (pre-installed in most distro)
2. Install `pkg-condig` from conda.
    Note: All the macOS jobs, including binary build jobs, uses conda. Using `pkg-config` from Conda makes it easy to discover the packages installed from conda. (like `ffmpeg` in https://github.com/pytorch/audio/issues/2122)
3. Add `pkg-config` to conda build-time dependency
4. Make sure that the availability of `pkg-config` is explicitly checked when `sox` is being configured. (otherwise, it will fail at somewhere in the middle of build process with somewhat unintuitve error message)

Pull Request resolved: https://github.com/pytorch/audio/pull/1873

Reviewed By: carolineechen, nateanl

Differential Revision: D33404975

Pulled By: mthrok

fbshipit-source-id: ae512d3a3a422ebfe3b46c492bed44deecc36e72

Summary:
Previously sox-related third-party source code was archived at
`third_party/sox/archives`.
Recently KenLM-related third-party source code was added and
they are archived at `third_party/archives`.

This PR changes the sox archive location to `third_party/archives`,
so that all the archvies are cached at the same location.

Pull Request resolved: https://github.com/pytorch/audio/pull/2086

Reviewed By: carolineechen

Differential Revision: D33236927

Pulled By: mthrok

fbshipit-source-id: 2f2aa5f4b386fefb46d7c98f7179c04995219f3c

Needed to allow building on M1

Downloaded from https://git.savannah.gnu.org/gitweb/?p=config.git;a=blob_plain;f=config.guess;hb=HEAD and https://git.savannah.gnu.org/gitweb/?p=config.git;a=blob_plain;f=config.sub;hb=HEAD

Replacing the config.guess with a newer version to support newer hardware, such as Nvidia Jetson.

Obtained from: https://git.savannah.gnu.org/gitweb/?p=config.git;a=blob_plain;f=config.guess;hb=HEAD

See: https://www.gnu.org/software/gettext/manual/html_node/config_002eguess.html

`wavpack` is a format not supported/tested in torchaudio.
Leaving the option blank can cause the issue like #1461 in untested environment.

* Fix fileobj I/O undeterministic behavior

Ever since the file-like object support was added in #1158, the test
was occasionally failing in CI. This PR fixes this.

* Switch to cmake for build
* Hide symbols