Moving the libusb-compat source from jumper to external.

Change-Id: Icd5631b38c4b1a16ae0f715d32c1e1d4ba82c435
diff --git a/AUTHORS b/AUTHORS
new file mode 100644
index 0000000..d2beff9
--- /dev/null
+++ b/AUTHORS
@@ -0,0 +1,2 @@
+Daniel Drake <dsd@gentoo.org>
+