Merge "aconfig: support api behind a macro flag in c/cpp" into main am: 4f358fd4

Original change: https://android-review.googlesource.com/c/platform/build/+/2787279



Change-Id: I8c24f749246a537187a9c649d38248d28383643f
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>