[scudo] Wrap clang pragma to avoid GCC error am: eed5c65736 am: baa8a79e17

Original change: https://android-review.googlesource.com/c/platform/external/scudo/+/2066953

Change-Id: I4f9ec0df5c9fbdb4ab3a05c81de26314dd927635
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>