Remove old libevent version tarballs

Change-Id: Iee1be4689bb3e8a8ee53c73fdb7c6f5f2d3d57f1
diff --git a/host-libevent-2.0.22-stable.tar.gz b/host-libevent-2.0.22-stable.tar.gz
deleted file mode 100644
index db88cad..0000000
--- a/host-libevent-2.0.22-stable.tar.gz
+++ /dev/null
Binary files differ
diff --git a/libevent-2.0.22-stable.tar.gz b/libevent-2.0.22-stable.tar.gz
deleted file mode 120000
index d086550..0000000
--- a/libevent-2.0.22-stable.tar.gz
+++ /dev/null
@@ -1 +0,0 @@
-host-libevent-2.0.22-stable.tar.gz
\ No newline at end of file