add SKIP_IF_XDP_NOT_SUPPORTED macro am: a36bed395f am: 7d7af8b3d8

Original change: https://android-review.googlesource.com/c/platform/system/bpf/+/1555041

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: Ic07142251645ff8fb6b37c7a6df25e30938b48a0