Summary:
Pull Request resolved: https://github.com/facebookresearch/faiss/pull/3807
This diff re-organizes the tests a bit:
* groups tests related to SWIG into a single file
* enable doxygen test conditionally
* removes a dep on platform.Version that does not exist on some envs
* move a few tests out of build_blocks to avoid it being a catch-all file for uncategorized tests
Reviewed By: asadoughi
Differential Revision: D61959750
fbshipit-source-id: fb6ada5b5a980ac07088254183d80b80ddfb1f45