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Summary:
Add KenLM and its dependencies required for static build (`zlib`, `bzip2`, `lzma` and `boost-thread`).

The KenLM and its dependencies are build but since no corresponding code on torchaudio side is changed, the resulting torchaudio extension module is not changed. (therefore, as long as build process passes on CI this PR should be good to go.)

Pull Request resolved: https://github.com/pytorch/audio/pull/2076

Reviewed By: carolineechen

Differential Revision: D33189980

Pulled By: mthrok

fbshipit-source-id: 6096113128b939f3cf70990c99aacc4aaa954584

Summary:
Resolves https://github.com/pytorch/audio/issues/2049, https://github.com/pytorch/audio/issues/1940

Pull Request resolved: https://github.com/pytorch/audio/pull/2050

Reviewed By: nateanl

Differential Revision: D32712513

Pulled By: mthrok

fbshipit-source-id: e1db81786bcca67605ff765d27e0527e20967d1c