[NFC][scudo] Move macro into a shared header am: d3eeaf8c13 am: 0526bfbaf5 am: e292039219

Original change: https://android-review.googlesource.com/c/platform/external/scudo/+/1670254

Change-Id: I69c9631b553a1e069e56c76c57e589fed5f289f1