Add Basename and Dirname backward compatibility am: 13523e6e4b

Original change: https://android-review.googlesource.com/c/platform/system/libbase/+/2323818

Change-Id: I67bc8c4ebb93a6380a162bb2383147926f8016e1
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>