Adding libevent-2.1.7-rc tarball

Change-Id: Ifc87ef21cae33329e53cfc96cbb8fca5760d7dfc
diff --git a/libevent-2.1.7-rc.tar.gz b/libevent-2.1.7-rc.tar.gz
new file mode 100644
index 0000000..c74004d
--- /dev/null
+++ b/libevent-2.1.7-rc.tar.gz
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