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Summary:
This PR addresses https://github.com/pytorch/audio/issues/2295 by updating `zlib`'s url to the one on sourceforge.net.
`zlib` 1.2.11 source code is removed from the official site. According to https://zlib.net, ```Due to the bug fixes, any installations of 1.2.11 should be replaced with 1.2.12.```
sourceforge preserves the older versions thus is more stable. The PR keep 1.2.11 as currently there is no 1.2.12 on sourceforge.

Pull Request resolved: https://github.com/pytorch/audio/pull/2297

Reviewed By: mthrok

Differential Revision: D35251361

Pulled By: nateanl

fbshipit-source-id: 174c2c2e1c34bef9799bbacfd1e12c8ff13ff15d

Summary:
After all the C++ code from https://github.com/pytorch/audio/issues/2072 are added, this commit will enable decoder/KenLM integration in the build process.

Pull Request resolved: https://github.com/pytorch/audio/pull/2078

Reviewed By: carolineechen

Differential Revision: D33198183

Pulled By: mthrok

fbshipit-source-id: 9d7fa76151d06fbbac3785183c7c2ff9862d3128

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