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: 529ce9cf am: e0bc6a83

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



Change-Id: I80a73223109578015662e94b9b7fad6a63bae8a3
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>