Update skqp's Android NDK to r20

Change-Id: Id479e8c29cff650de17ea2f58d1c3811b2dbac86
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/225544
Reviewed-by: Kevin Lubick <kjlubick@google.com>
Reviewed-by: Joe Gregorio <jcgregorio@google.com>
Commit-Queue: Kevin Lubick <kjlubick@google.com>
4 files changed