BpfUtils.h - add back SKIP_IF_BPF_NOT_SUPPORTED macro am: 67fa2073ff am: 625c2c6bc6 am: c5468f82d4

Original change: https://android-review.googlesource.com/c/platform/system/bpf/+/1631935

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I0e6a740dcb11c9c8ea73ba9aa8646e473a5a3242