libbpf: Update submodule version

Update the libbpf submodule to the latest version, and update the configure
script so we check for the newer bpf_object__next_program() helper (to fix
deprecation warnings).

Signed-off-by: Toke Høiland-Jørgensen <toke@redhat.com>

configure

@@ -96,6 +96,7 @@ int main(int argc, char **argv) {
     (void) bpf_map__set_initial_value(ptr, ptr, 0);
     (void) bpf_set_link_xdp_fd_opts(0, 0, 0, &lopts);
     (void) bpf_tc_attach(ptr, ptr);
+    (void) bpf_object__next_program(ptr, ptr);
     return 0;
 }
 EOF