Delete "libselinux.so.1"

Use the libselinux.so library that's already compiled for the host
rather than relying on a prebuilt library. Add functions needed by
the prebuilt python wrappers.

While I'm here, delete -DDARWIN. This define is no longer used as of
commit bedef7d12493e5785537c1f8e46ce32c3e34bf32

Bug: 33170640
Test: code compiles
Test: audit2allow, audit2why, sediff, and search work

Change-Id: I4c8d9eef6149339744e9b3ef823683289d25551c
7 files changed