package version metadata for external/

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Change-Id: I4c07151cf799cebbfb595393a4158f98b24d38ec
diff --git a/README.version b/README.version
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+URL: http://sourceforge.net/projects/tinyxml/files/tinyxml/2.4.0/tinyxml_2_4_0.tar.gz/download
+Version: 2.4.0
+BugComponent: 24950
+AllAdvisories: yes