libbpf: Fix LIBBPF_1.0.0 declaration in libbpf.map

Add the missing LIBBPF_0.8.0 at the end of the LIBBPF_1.0.0 declaration,
similarly to other version declarations.
Signed-off-by: NRoberto Sassu <roberto.sassu@huawei.com>
Signed-off-by: NAndrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20221006110736.84253-2-roberto.sassu@huaweicloud.com

tools/lib/bpf/libbpf.map

@@ -367,7 +367,7 @@ LIBBPF_1.0.0 {
 		libbpf_bpf_map_type_str;
 		libbpf_bpf_prog_type_str;
 		perf_buffer__buffer;
-};
+} LIBBPF_0.8.0;
 
 LIBBPF_1.1.0 {
 	global: