Avoid link failure on arches using ld.bfd.

Index: Makefile.in
--- Makefile.in.orig
+++ Makefile.in
@@ -98,7 +98,8 @@ qrouternullg$(EXEEXT): $(OBJECTS4)
 	$(RM) qrouternullg$(EXEEXT)
 	$(CC) ${CFLAGS} ${CPPFLAGS} ${DEFS} ${EXTRA_DEFS} \
 		${SOURCES4} ${INC_SPECS} -o $@  ${LIB_SPECS_NOSTUB} \
-		${LD_RUN_PATH} ${LDFLAGS} ${LIBS} ${EXTRA_LIB_SPECS} -lm
+		${LD_RUN_PATH} ${LDFLAGS} ${X_PRE_LIBS} -lX11 ${X_LIBS} \
+		${X_EXTRA_LIBS} ${LIBS} ${EXTRA_LIB_SPECS} -lm
 
 install-nointerp:
 	@echo "Installing qrouter"