libbpf: sync with latest libbpf

chenhengqi · chenhengqi · commit e37075dd3bcc · 2021-05-04T23:17:33.000+08:00
Signed-off-by: Hengqi Chen &lt;chenhengqi@outlook.com&gt;
diff --git a/common/common.mk b/common/common.mk
@@ -45,7 +45,7 @@ LDFLAGS ?= -L$(LIBBPF_DIR)
 
 BPF_CFLAGS ?= -I$(LIBBPF_DIR)/build/usr/include/ -I../headers/
 
-LIBS = -l:libbpf.a -lelf $(USER_LIBS)
+LIBS = -l:libbpf.a -lelf -lz $(USER_LIBS)
 
 all: llvm-check $(USER_TARGETS) $(XDP_OBJ) $(COPY_LOADER) $(COPY_STATS)
 
diff --git a/libbpf b/libbpf
@@ -1 +1 @@
-Subproject commit b91f53ec5f1aba2a9d01dc00c4434063abd921e8
+Subproject commit 9e123fa5d20017923ec39b5af5f269488b7073d6
