use LDFLAGS to build dwl target

Makefile

@@ -22,7 +22,7 @@ LDLIBS    = `pkg-config --libs $(PKGS)`
 # to your build system yourself and provide them in the include path.
 all: dwl
 dwl: dwl.o util.o
-	$(CC) $(LDLIBS) -o $@ dwl.o util.o
+	$(CC) $(LDLIBS) $(LDFLAGS) -o $@ dwl.o util.o
 dwl.o: dwl.c config.mk config.h client.h xdg-shell-protocol.h wlr-layer-shell-unstable-v1-protocol.h idle-protocol.h
 util.o: util.c util.h