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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