Use libabigail to track NDK ABIs.

The local diffing behavior is currently flagged off so we can land
this in stages.

Test: pytest cc
Test: treehugger
Test: development/tools/update_ndk_abi.sh
Test: m ndk
Bug: http://b/156513478
Change-Id: Iccb314411bc74ea3ddfea8b85b0539709295f65a