[PATCH] Makefile: Fix a compile error on Debian with pthread

On Debian 10, "make" reports errors about undefined reference to
`pthread_rwlock_tryrdlock'. To fix it, put -ldw before -lpthread
in the Makefile.

Signed-off-by: Jiang Wang <jiang.wang@bytedance.com>

Makefile

@@ -68,7 +68,7 @@ endif
 CFLAGS += -DUSESNAPPY
 endif
 
-LIBS := -lpthread $(LIBS)
+LIBS := $(LIBS) -lpthread
 
 try-run = $(shell set -e;		\
 	TMP=".$$$$.tmp";		\