Merge "Soong: libbpf_prog: Define ENABLE_LIBBPF" into main am: 1a6f176ce0 am: 88d2f096a3

Original change: https://android-review.googlesource.com/c/platform/build/soong/+/3367694

Change-Id: I7e7d85ad4f671364f6772b9466e774ef9046fbd5
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>
diff --git a/bpf/libbpf/libbpf_prog.go b/bpf/libbpf/libbpf_prog.go
index 18e03a5..3b26d46 100644
--- a/bpf/libbpf/libbpf_prog.go
+++ b/bpf/libbpf/libbpf_prog.go
@@ -158,7 +158,8 @@
 		"-Wall",
 		"-Werror",
 		"-Wextra",
-
+		// Flag to assist with the transition to libbpf
+		"-DENABLE_LIBBPF",
 		"-isystem bionic/libc/include",
 		"-isystem bionic/libc/kernel/uapi",
 		// The architecture doesn't matter here, but asm/types.h is included by linux/types.h.