Remove unnecessary dependency from macOS/Conda binaries

[mthrok]

This commit updates the dependency description on Conda package,
so that FFmpeg is installed only on platforms on which torchvision comes with the corresponding extension.

• Currently, FFmpeg integration is enabled only for Linux.

vision/setup.py

Lines 366 to 367 in a8ebd0b

	if sys.platform != "linux" or (sys.version_info.major == 3 and sys.version_info.minor == 9):
	has_ffmpeg = False

• For binary packaging, even for Linux, it is excluded in wheel. (due to the lack of build-time dependency in CI)

https://github.com/pytorch/vision/actions/runs/6678010959/job/18148611653#step:14:106

• The Linux/Conda package is still built with FFmpeg after this commit

https://github.com/pytorch/vision/actions/runs/6695315792/job/18190638421?pr=8077#step:9:199

[pytorch-bot]

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✅ You can merge normally! (16 Unrelated Failures)

As of commit 0f7e665 with merge base a8ebd0b ():

FLAKY - The following jobs failed but were likely due to flakiness present on trunk:

• CMake / linux (linux.g5.4xlarge.nvidia.gpu, cuda, 11.8) / linux-job (gh)
• CMake / macos (macos-12) / macos-job (gh)
• CMake / macos (macos-m1-12) / macos-job (gh)
• CMake / windows (windows.4xlarge, cpu) / windows-job (gh)
• Prototype tests on Linux / unittests-prototype (3.8, linux.g5.4xlarge.nvidia.gpu, cuda, 11.8) / linux-job (gh)
• Tests / unittests-linux (3.8, linux.g5.4xlarge.nvidia.gpu, cuda, 11.8) / linux-job (gh)
• Tests / unittests-macos (3.10, macos-12) / macos-job (gh)
• Tests / unittests-macos (3.11, macos-12) / macos-job (gh)
• Tests / unittests-macos (3.8, macos-12) / macos-job (gh)
• Tests / unittests-macos (3.8, macos-m1-12) / macos-job (gh)
• Tests / unittests-macos (3.9, macos-12) / macos-job (gh)
• Tests / unittests-windows (3.10, windows.4xlarge, cpu) / windows-job (gh)
• Tests / unittests-windows (3.11, windows.4xlarge, cpu) / windows-job (gh)
• Tests / unittests-windows (3.8, windows.4xlarge, cpu) / windows-job (gh)
• Tests / unittests-windows (3.9, windows.4xlarge, cpu) / windows-job (gh)

BROKEN TRUNK - The following job failed but were present on the merge base:

👉 Rebase onto the `viable/strict` branch to avoid these failures

• Build Linux Wheels / pytorch/vision / manywheel-py3_8-rocm5_6 (gh)

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[mthrok]

@NicolasHug Review please.

[pmeier]

LGTM, thanks @mthrok!

[mthrok]

@pmeier Thanks. I don't have a merge privilege. Could you merge it?

[github-actions]

Hey @pmeier!

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