core157: Ship libevent2

Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>

diff --git a/config/rootfiles/core/157/filelists/libevent2 b/config/rootfiles/core/157/filelists/libevent2
new file mode 120000 (symlink)
index 0000000..42edc99
--- /dev/null
+++ b/config/rootfiles/core/157/filelists/libevent2
@@ -0,0 +1 @@
+../../../common/libevent2
\ No newline at end of file