configure: Detect presence of bpf_program__type()

The bpf_program__type() helper was renamed from bpf_program__get_type() in
libbpf 0.7.0, so add detection for this and redefine the new name as a
wrapper if it is not present.

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

configure

@@ -276,6 +276,7 @@ check_libbpf_functions()
     check_libbpf_function "bpf_object__next_map" "(NULL, NULL)" "" "$LIBBPF_CFLAGS" "$LIBBPF_LDLIBS"
     check_libbpf_function "bpf_object__next_program" "(NULL, NULL)" "" "$LIBBPF_CFLAGS" "$LIBBPF_LDLIBS"
     check_libbpf_function "bpf_program__insn_cnt" "(NULL)" "" "$LIBBPF_CFLAGS" "$LIBBPF_LDLIBS"
+    check_libbpf_function "bpf_program__type" "(NULL)" "" "$LIBBPF_CFLAGS" "$LIBBPF_LDLIBS"
     check_libbpf_function "bpf_map_create" "(0, NULL, 0, 0, 0, NULL)" "" "$LIBBPF_CFLAGS" "$LIBBPF_LDLIBS"
     check_libbpf_function "perf_buffer__new_raw" "(0, 0, NULL, NULL, NULL, NULL)" "" "$LIBBPF_CFLAGS" "$LIBBPF_LDLIBS"
     check_libbpf_function "bpf_xdp_attach" "(0, 0, 0, NULL)" "" "$LIBBPF_CFLAGS" "$LIBBPF_LDLIBS"

lib/libxdp/libxdp.c

@@ -312,6 +312,13 @@ static size_t bpf_program__insn_cnt(const struct bpf_program *prog)
 }
 #endif
 
+#ifndef HAVE_LIBBPF_BPF_PROGRAM__TYPE
+static inline enum bpf_prog_type bpf_program__type(const struct bpf_program *prog)
+{
+	return bpf_program__get_type((struct bpf_program *)prog);
+}
+#endif
+
 /* This function has been deprecated in libbpf, but we expose an API that uses
  * section names, so we reimplement it to keep compatibility
  */