Cleanup: remove redundant deleting on *~ files

Signed-off-by: Wolfgang Denk <wd@denx.de>
diff --git a/board/sandburst/karef/Makefile b/board/sandburst/karef/Makefile
index 241f4a7..49d240c 100644
--- a/board/sandburst/karef/Makefile
+++ b/board/sandburst/karef/Makefile
@@ -56,7 +56,7 @@
 	rm -f $(SOBJS) $(OBJS)
 
 distclean:	clean
-	rm -f $(LIB) core *.bak $(obj).depend *~
+	rm -f $(LIB) core *.bak $(obj).depend
 
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