Remove BUILD_SOX and USE_FFMPEG flags

[samanklesaria]

Now that sox and ffmpeg are not part of torchaudio, we can remove these build flags from CMakeLists.

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/audio/4100

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❌ 5 New Failures

As of commit bc655e6 with merge base fa51429 ():

NEW FAILURES - The following jobs have failed:

• .github/workflows/integration-test.yml (gh)
• Build Aarch64 Linux Wheels / pytorch/audio / build-wheel-py3_10-cuda-aarch6413_0-aarch64 (gh)
  ImportError: libarm_compute.so: cannot open shared object file: No such file or directory
• Build Aarch64 Linux Wheels / pytorch/audio / upload / upload-wheel-py3_10-cuda-aarch6413_0-aarch64 (gh)
  Unable to download artifact(s): Artifact not found for name: pytorch_audio__3.10_cu130_aarch64
• Build Windows Wheels / pytorch/audio / build-wheel-py3_10-cuda13_0 (gh)
• Build Windows Wheels / pytorch/audio / upload / upload-wheel-py3_10-cuda13_0 (gh)
  Unable to download artifact(s): Artifact not found for name: pytorch_audio__3.10_cu130_x64

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[pearu]

LGTM! Thanks, @samanklesaria!