Merge "Restrict libscudo visibility." am: 654096ecd1 am: 014c287d6a am: 61446e3909

Original change: https://android-review.googlesource.com/c/platform/external/scudo/+/1431985

Change-Id: If4afec87b1daaa2f98cd5c17aa4a0507c3c9c1c0