Add missing defines to Bionic config. am: 4f612f6192 am: 565da5a0d9 am: 98eb56d705

Original change: https://android-review.googlesource.com/c/platform/external/libevent/+/2808694

Change-Id: If70b273a3567452a06b5862d036113e07a79739c
Signed-off-by: Automerger Merge Worker <[email protected]>