main: use sdeventplus

Make use of the RAII that comes with the sdeventplus c++ bindings for
the sd_event library.

Change-Id: Ie655766fdc625e1150c956b2eb16e0352e7c3859
Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>
diff --git a/meson.build b/meson.build
index af82637..1fb5d35 100644
--- a/meson.build
+++ b/meson.build
@@ -167,6 +167,7 @@
         dependency('phosphor-dbus-interfaces'),
         dependency('phosphor-logging'),
         dependency('sdbusplus'),
+        dependency('sdeventplus'),
     ],
     install: true
 )