libbpf: Move few APIs from 0.4 to 0.5 version

Official libbpf 0.4 release doesn't include three APIs that were tentatively
put into 0.4 section. Fix libbpf.map and move these three APIs:

  - bpf_map__initial_value;
  - bpf_map_lookup_and_delete_elem_flags;
  - bpf_object__gen_loader.
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20210603004026.2698513-2-andrii@kernel.org

tools/lib/bpf/libbpf.map

@@ -359,10 +359,7 @@ LIBBPF_0.4.0 {
 		bpf_linker__finalize;
 		bpf_linker__free;
 		bpf_linker__new;
-		bpf_map__initial_value;
 		bpf_map__inner_map;
-		bpf_map_lookup_and_delete_elem_flags;
-		bpf_object__gen_loader;
 		bpf_object__set_kversion;
 		bpf_tc_attach;
 		bpf_tc_detach;
@@ -373,5 +370,8 @@ LIBBPF_0.4.0 {
 
 LIBBPF_0.5.0 {
 	global:
+		bpf_map__initial_value;
+		bpf_map_lookup_and_delete_elem_flags;
+		bpf_object__gen_loader;
 		libbpf_set_strict_mode;
 } LIBBPF_0.4.0;