Add missing defines to Bionic config. am: 4f612f6192 am: 00ca46dec0

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

Change-Id: Ie30579a4d4de4f0743183b8864d4ef92d40d9189
Signed-off-by: Automerger Merge Worker <[email protected]>