Back out "Revert D29687143: [3/N] Nnapi Backend Delegate Preprocess: Basic OSS Test" (#61878)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/61878
CMakeLists.txt
Android NNAPI delegate library was moved from test/cpp/jit/CMakeLists.txt to torch/CMakeLists.txt. This resolves the issue the original PR had, where the NNAPI delegate library was added to builds without Python (when it depends on Python).
Original PR: https://github.com/pytorch/pytorch/pull/61594
There's an error where the library cannot be built on MacOS. This problem existed in the original PR as well, but now an issue has been created: https://github.com/pytorch/pytorch/issues/61930
test_backend_nnapi.py
Also changed the skip unit test headers so that it's a little cleaner. Now the unit tests are skipped if the Nnapi delegate library file is not found. Previously, the skip was based on the platform (only allowing Linux).
Test Plan:
To run NNAPI delegate unit tests: `python test/test_jit.py TestNnapiBackend`
Imported from OSS
Reviewed By: iseeyuan
Differential Revision: D29799895
fbshipit-source-id: b69a767b5cde3814b0853cfbc84d61ab4155f619
