Move "ar" flags to config.mk to allow for silent "make -s"
Based on patch by Mike Frysinger, 20 Jun 2006
diff --git a/board/impa7/Makefile b/board/impa7/Makefile
index d77db72..b64d85f 100644
--- a/board/impa7/Makefile
+++ b/board/impa7/Makefile
@@ -33,7 +33,7 @@
 SOBJS	:= $(addprefix $(obj),$(SOBJS))
 
 $(LIB):	$(obj).depend $(OBJS) $(SOBJS)
-	$(AR) crv $@ $(OBJS) $(SOBJS)
+	$(AR) $(ARFLAGS) $@ $(OBJS) $(SOBJS)
 
 clean:
 	rm -f $(SOBJS) $(OBJS)