It appears that yesterday build of libevent bumped its soname. That
means that, at minimum, Memcahed is broken now.
BTW it is well possible, that the packager did not noticed the soname
bump, since the libraries are included into package by wildcards in
files section [1]. I consider this bad practice precisely due to
consequences like this.
Vít
[1]
https://src.fedoraproject.org/rpms/libevent/blob/master/f/libevent.spec#_104