package version metadata for external/

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Change-Id: I0264ddc9e46e7f0161e8c30d136cfdb99a147ad9
diff --git a/README.version b/README.version
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--- /dev/null
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+URL: http://www.skbuff.net/iputils/iputils-s20121221.tar.bz2
+Version: s20121221
+BugComponent: 30545