[PATCH bpf-next v2 2/2] selftests/bpf: fix static cross-compile error for liblstd.a linking.

[Lin Yikai]

Regard "LDLIBS += -lzstd" as a separate patch for static compile.
To fix static cross-compile error like this:

  $LDLIBS=-static LDFLAGS=--sysroot=/aarch64-linux-gnu/libc ./vmtest.sh -s -- ./test_progs

  /aarch64-linux-gnu/bin/ld: aarch64-linux-gnu/libc/usr/lib/libelf.a(elf_compress.o): in function `__libelf_compress':
  (.text+0xec): undefined reference to `ZSTD_createCCtx'
  /aarch64-linux-gnu/bin/ld: (.text+0xf0): undefined reference to `ZSTD_createCCtx'
  ...

Signed-off-by: Lin Yikai <yikai.lin@xxxxxxxx>
---
 tools/testing/selftests/bpf/Makefile | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/testing/selftests/bpf/Makefile b/tools/testing/selftests/bpf/Makefile
index 3f0f9a171651..17d75ac2f461 100644
--- a/tools/testing/selftests/bpf/Makefile
+++ b/tools/testing/selftests/bpf/Makefile
@@ -46,7 +46,7 @@ CFLAGS += -g $(OPT_FLAGS) -rdynamic					\
 	  -I$(CURDIR) -I$(INCLUDE_DIR) -I$(GENDIR) -I$(LIBDIR)		\
 	  -I$(TOOLSINCDIR) -I$(APIDIR) -I$(OUTPUT)
 LDFLAGS += $(SAN_LDFLAGS)
-LDLIBS += $(LIBELF_LIBS) -lz -lrt -lpthread
+LDLIBS += $(LIBELF_LIBS) -lz -lrt -lpthread -lzstd
 
 PCAP_CFLAGS	:= $(shell $(PKG_CONFIG) --cflags libpcap 2>/dev/null && echo "-DTRAFFIC_MONITOR=1")
 PCAP_LIBS	:= $(shell $(PKG_CONFIG) --libs libpcap 2>/dev/null)
-- 
2.34.1