Skip jpeg comparison tests with PIL (#5169)

[datumbox]

Cherrypicking #5169 on release branch

[facebook-github-bot]

💊 CI failures summary and remediations

As of commit 0c66944 (more details on the Dr. CI page):

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• 4/7 failures introduced in this PR
• 3/7 broken upstream at merge base e7ec7e2 since Dec 30

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4 failures not recognized by patterns:

Job	Step	Action
cmake_linux_gpu	Build torchvision C++ distribution and test	🔁 rerun
cmake_macos_cpu	curl -o conda.sh https://repo.anaconda.com/miniconda/Miniconda3-latest-MacOSX-x86_64.sh
sh conda.sh -b
source $HOME/miniconda3/bin/activate
conda install -yq conda-build cmake
packaging/build_cmake.sh
	🔁 rerun
cmake_linux_cpu	packaging/build_cmake.sh	🔁 rerun
cmake_windows_cpu	set -ex
source packaging/windows/internal/vc_install_helper.sh
packaging/build_cmake.sh
	🔁 rerun

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🚧 3 ongoing upstream failures:

These were probably caused by upstream breakages that are not fixed yet.

• unittest_windows_cpu_py3.6 since Dec 30 (64d21d1)
  • 🔁 rerun
• unittest_macos_cpu_py3.6 since Dec 30 (64d21d1)
  • 🔁 rerun
• unittest_linux_cpu_py3.6 since Dec 30 (64d21d1)
  • 🔁 rerun

---

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[NicolasHug]

Thanks @datumbox