Removal of pointer arithmetic code sections. am: 117d5bda52 am: a8601dd407 am: 50f24cd783 am: d35ff103c0

Original change: https://android-review.googlesource.com/c/platform/external/libxaac/+/1441872

Change-Id: I27f9c23a2523bcf92511ea5538ab44b506c967fb