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* Pin MKL to 2021.2.0

Fixes https://github.com/pytorch/pytorch/issues/62424

* Apply the same  constraint for conda builds

Use less-than-equals constraint to avoid dependency conflicts for
python-3.6 environment

Summary:
- Add linear_fbank method
- Add LFCC in transforms

Rebases #1571; addresses #1569:

"In 0.9.0 we are deprecating the lazy behavior of MelScale because it can make an invalid 
TorchScript object and it does not align with the design of torchaudio. Now in master 
branch, we can remove the implementation."
Co-authored-by: Pankaj Patil <pankaj.patil2099@hotmail.com>
Co-authored-by: moto <855818+mthrok@users.noreply.github.com>
Co-authored-by: hwangjeff <jeffhwang@fb.com>

Porting Tacotron2 from https://github.com/NVIDIA/DeepLearningExamples/blob/master/PyTorch/SpeechSynthesis/Tacotron2/tacotron2/model.py

`torchaudio._internal.fft` was originally added to account for the introduction of module `torch.fft`, when `torch.fft` could refer to either a module or function. Now that `torch.fft` refers unambiguously to a module, we remove `torchaudio._internal.fft` and replace references to it with `torch.fft`.

The test was broken from the beginning and for a reason unrelated to
ROCm, but was disabled for ROCm in https://github.com/pytorch/audio/pull/1411.
https://github.com/pytorch/audio/pull/1604 fixed the test so that we are re-enabling it.

* [BC-Breaking] Default to PCM_16 for flac on soundfile backend

Resolving https://github.com/pytorch/audio/issues/1592

The test backend/soundfile/save_test.py::TestFileObject::test_fileobj_flac
is failing due to the fact that when soundfile.write received
subtype=None (for flac files), it would fall back to 'PCM_16'.
But in the same time, torchaudio will use 'PCM_24', which would
result in distorted signal.

This commit fixed this issue by changing the default bit-per-sample
of for flac files from 24-bit to 16-bit.

No longer needed for Python 3.9
Signed-off-by: Eli Uriegas <eliuriegas@fb.com>

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