Add LDFLAGS variable to Makefile, make sure the extra linker flags can be passed.

Upstream-Status: Pending

Signed-off-by: Yi Zhao <yi.zhao@windriver.com>

diff --git a/Makefile b/Makefile
index 77f3364..c98083f 100644
--- a/Makefile
+++ b/Makefile
@@ -18,7 +18,7 @@ clean:
 
 zeroconf: zeroconf.o delay.o
 	$(Q)echo "Creating $@"
-	$(Q)$(CC) $(CFLAGS) -o $@ $^ $(LIBS)
+	$(Q)$(CC) $(CFLAGS) ${LDFLAGS} -o $@ $^ $(LIBS)
 
 
 # Automatic dependency generation