package version metadata for external/

This will be used for automated notification of external vulnerability
reports.

(cherrypicked from commit 8dc37401ddfcb3c35b09eb02a06bd167a693bfff)

Change-Id: Iaca4c74c644db5303382f1ab42c0aa154688a4a4
diff --git a/README.version b/README.version
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+URL: http://sourceforge.net/projects/sqlite.mirror/files/SQLite%203.8.6/sqlite-amalgamation-3080600.zip/download
+Version: 3.8.6
+BugComponent: 24950