Add missing defines to Bionic config. am: 4f612f6192

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

Change-Id: I797576d1c9c7f41d06f696d8c48362dd5de2b138
Signed-off-by: Automerger Merge Worker <[email protected]>