package version metadata for external/

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Change-Id: I966e26b9ec7765487fcb06e7aadf70f0ae226e71

README.version

diff --git a/README.version b/README.version
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+URL: http://sourceforge.net/projects/libusb/files/libusb-0.1%20%28LEGACY%29/0.1.12/libusb-0.1.12.tar.gz/download
+Version: 0.1.12