Revert "Remove old libevent 2.1.5-beta tarball"

This reverts commit ff589624b476fc98d1d0916a5c63ab3f0f829301.

Change-Id: Ie194d30549dead026e7e5d64acc75c1a4482e13f
diff --git a/libevent-2.1.5-beta.tar.gz b/libevent-2.1.5-beta.tar.gz
new file mode 100644
index 0000000..fb89f2f
--- /dev/null
+++ b/libevent-2.1.5-beta.tar.gz
Binary files differ