Restrict header visibility again am: 755ff06436

Original change: https://android-review.googlesource.com/c/platform/external/libabigail/+/2337562

Change-Id: Ie4d1892526d7df7e33eb4991ff5e475ed2f8536b
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>