pg_dump with --binary-upgrade must emit ALTER EXTENSION ADD commands
for all objects that are members of extensions.  It forgot to do so for
event triggers, as per bug #15310 from Nick Barnes.  Back-patch to 9.3
where event triggers were introduced.

Haribabu Kommi

Discussion: https://postgr.es/m/153360083872.1395.4593932457718151600@wrigleys.postgresql.org