Fix "ar" flags in some Makefiles to allow for silent "make -s"
diff --git a/lib_avr32/Makefile b/lib_avr32/Makefile
index 5b6300b..cf20836 100644
--- a/lib_avr32/Makefile
+++ b/lib_avr32/Makefile
@@ -35,7 +35,7 @@
 OBJS	:= $(addprefix $(obj),$(SOBJS) $(COBJS))
 
 $(LIB):	$(obj).depend $(OBJS)
-	$(AR) crv $@ $(OBJS)
+	$(AR) $(ARFLAGS) $@ $(OBJS)
 
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