Embed `libiomp5.dylib` into wheel package (#47262)
Summary:
libiomp runtime is the only external dependency OS X package has if compiled with MKL
Copy it to the stage directory from one of the available rpathes
And remove all absolute rpathes, since project shoudl have none
Fixes https://github.com/pytorch/pytorch/issues/38607
Pull Request resolved: https://github.com/pytorch/pytorch/pull/47262
Reviewed By: walterddr
Differential Revision: D24705094
Pulled By: malfet
fbshipit-source-id: 9f588a3ec3c6c836c8986d858fb53df815a506c8
