The SDK does not have the LLVM toolchain yet.
Hopefully fixes errors in the form:
xsk_def_xdp_prog.c:4:10: fatal error: 'bpf/bpf_helpers.h' file not found
#include <bpf/bpf_helpers.h>
Fixes: 6ad1bea2a603 ("xdp-tools: add package")
Signed-off-by: Nick Hainke <vincent@systemli.org>