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

Merge "aconfig: support api behind a macro flag in c/cpp" into main am: 4f358fd4 am: d5e38b58 am: ab69556e

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



Change-Id: Ide9be7b2f87be0757bf74112331df5ceeb4e0efe
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>