sync with latest libbpf repo

Sync with latest libbpf repo.

Signed-off-by: Yonghong Song <yhs@fb.com>
diff --git a/introspection/bps.c b/introspection/bps.c
index 4993b8e..d3295f8 100644
--- a/introspection/bps.c
+++ b/introspection/bps.c
@@ -39,6 +39,7 @@
   [BPF_PROG_TYPE_LIRC_MODE2] = "lirc_mode2",
   [BPF_PROG_TYPE_SK_REUSEPORT] = "sk_reuseport",
   [BPF_PROG_TYPE_FLOW_DISSECTOR] = "flow_dissector",
+  [BPF_PROG_TYPE_CGROUP_SYSCTL] = "cgroup_sysctl",
 };
 
 static const char * const map_type_strings[] = {