fix CUDA build with NVCC_FLAGS in env

[stefantalpalaru]

No description provided.

[pytorch-bot]

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🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/vision/8692

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❌ 1 New Failure, 1 Unrelated Failure

As of commit 9a547d5 with merge base 945bdad ():

NEW FAILURE - The following job has failed:

• Lint / c-source / linux-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

• Tests / unittests-windows (3.9, windows.g5.4xlarge.nvidia.gpu, cuda, 11.8) / windows-job (gh) (trunk failure)
  AttributeError: '_OpNamespace' 'image' object has no attribute '_jpeg_version'

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[NicolasHug]

Oops, thanks @stefantalpalaru

[github-actions]

Hey @NicolasHug!

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