bpfLoader as a lib - make it actually build/work am: 6d4d9d89c2 am: e22c59df46

Original change: https://android-review.googlesource.com/c/platform/system/bpf/+/3209890

Change-Id: I4af71651f13559d5a8c28bf615b86047cc7428ef
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>