Restrict header visibility again am: 755ff06436 am: 1fbb0b2106

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

Change-Id: Ic6ebbeef9109f7f5298846f13780b54e97c9503f
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>