bpf: Change the include directory for selftest

Use the tools include directory instead of the installed one to allow
builds from other kernels.
Signed-off-by: Mickaël Salaün <mic@digikod.net>
Cc: Alexei Starovoitov <ast@fb.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Daniel Borkmann <daniel@iogearbox.net>
Cc: David S. Miller <davem@davemloft.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

tools/testing/selftests/bpf/Makefile

-CFLAGS += -Wall -O2 -I../../../../usr/include
+CFLAGS += -Wall -O2 -I../../../include/uapi
 
 test_objs = test_verifier test_tag test_maps test_lru_map test_lpm_map