bpftool: Stop using deprecated bpf_load_program()

Switch to bpf_prog_load() instead.
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20211103220845.2676888-7-andrii@kernel.org

tools/bpf/bpftool/feature.c

@@ -467,7 +467,7 @@ static bool probe_bpf_syscall(const char *define_prefix)
 {
 	bool res;
 
-	bpf_load_program(BPF_PROG_TYPE_UNSPEC, NULL, 0, NULL, 0, NULL, 0);
+	bpf_prog_load(BPF_PROG_TYPE_UNSPEC, NULL, NULL, NULL, 0, NULL);
 	res = (errno != ENOSYS);
 
 	print_bool_feature("have_bpf_syscall",