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Summary:
Makes it specific to which version of otool and install_name_tool we actually prefer since using the one from conda can produce inconsistent results

Fixes https://github.com/pytorch/audio/issues/2806

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

Pull Request resolved: https://github.com/pytorch/audio/pull/2828

Reviewed By: malfet, mthrok

Differential Revision: D40960633

Pulled By: seemethere

fbshipit-source-id: 5010c06578f1efc4fe314f9a3ff47f18e14ad156

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