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Summary:
Retrieve version from version.txt
These improvement introduced in following PR: https://github.com/pytorch/vision/pull/6117
In addition to this we add version.txt file to help us manage torchaudio version

Pull Request resolved: https://github.com/pytorch/audio/pull/2434

Reviewed By: mthrok

Differential Revision: D36867886

Pulled By: atalman

fbshipit-source-id: 14b6d653e46489d8db1c5ae2016a8202c632861e

Summary:
This commit changes the way torchaudio binary distributions are built.

* For all the binary distributions (conda/pip on Linux/macOS/Windnows), build custom FFmpeg libraries.
* The custom FFmpeg libraries do not use `--use-gpl` nor `--use-nonfree`, so that they stay LGPL.
* The custom FFmpeg libraries employ rpath so that the torchaudio binary distributions look for the corresponding FFmpeg libraries installed in the runtime environment.
* The torchaudio binary build process will use them to bootstrap its build process.
* The custom FFmpeg libraries are NOT shipped.

This commit also add disclaimer about FFmpeg in README.

Pull Request resolved: https://github.com/pytorch/audio/pull/2355

Reviewed By: nateanl

Differential Revision: D36202087

Pulled By: mthrok

fbshipit-source-id: c30e5222ba190106c897e42f567cac9152dbd8ef

Summary: Pull Request resolved: https://github.com/pytorch/audio/pull/2250

Reviewed By: mthrok

Differential Revision: D34302192

Pulled By: nateanl

fbshipit-source-id: 4ea7047503ef87e22b5ef6075ad010314d5e3885

Also update README.md to mention 1.9.1

* Remove some obsolete conditions about CUDA-10.0 from `pkg_helpers.bash`.
* Use `USE_CUDA` instead of `FORCE_CUDA` in `pkg_helpers.bash`
* Do not define `NO_CUDA_PACKAGE` in build_wheel.sh and build_cuda.sh
* Add conda-forge for Win cuda-11.1 builds
* Pass USE_CUDA / TORCH_CUDA_ARCH_LIST to conda build
* Add selected CUDA to path
* Don't define USE_CUDA for ROCM

TODO: Fix Windows CUDA builds

* Default to BUILD_SOX=1 in non-Windows systems

Since the adaptation of CMake and restricting to the static linking of libsox,
the build process has become much robust with libsox integration enabled.

This commit makes it default behavior to build libsox integration in non-Windows systems.
The build process still checks BUILD_SOX env var so, setting `BUILD_SOX=0` disables it.

* Switch to cmake for build
* Hide symbols

Signed-off-by: Eli Uriegas <eliuriegas@fb.com>

* Use env var for switching SoX build and default to not

* Update README

* Fix packaging/CI script

* Clean up extension build mechanism and extension location

* Add back the switch to depend on external sox

* Remove print

* Fix

* Add windows binary jobs

* Make wheel package platform-specific and python-version-specific

* Refactor version suffix so conda packages don't get suffixes.
Signed-off-by: Edward Z. Yang <ezyang@fb.com>

* typofix
Signed-off-by: Edward Z. Yang <ezyang@fb.com>

Also bugfixes and updates to the packaging scripts.

Signed-off-by: Edward Z. Yang <ezyang@fb.com>

* New entry points are packaging/build_wheel.sh and packaging/build_conda.sh. The only mandatory environment variable you have to set is PYTHON_VERSION
* CircleCI configuration uses 2.1-style parametrized builds to let you toggle python version, etc. as you do builds. We create a separate job per build configuration for maximum parallelism
* build_tools/packaging got moved to packaging, to be in-line with directory structure in torchvision
* The build_conda.sh and build_wheel.sh delegate most of the heavy lifting to pkg_helpers.bash, which defines a number of bash functions for performing common operations. The intent is that I'll copy-paste this file between other domain API projects.
* TORCHAUDIO_ prefix removed from envvars, so that I can more easily share packaging scripts between projects
* BUILD_VERSION is completely gone; just change the version number if you need to rebuild
* No more logic for cloning and checking out a fresh copy of torchaudio