Add libevent build script, callable from tmux build script

4 jobs for master in 16 minutes and 28 seconds (queued for 2 seconds)
latest
Status Name Job ID Coverage
  Build
failed tmux #8682
docker

00:04:43

passed vim #8680
docker

00:06:26

manual vim_build_dependencies #8681
docker allowed to fail manual
passed zsh #8679
docker

00:05:18

 
Name Stage Failure
failed
tmux Build
checking for library containing clock_gettime... none required
checking for LIBEVENT... no
checking for library containing event_init... no
checking event.h usability... no
checking event.h presence... no
checking for event.h... no
configure: error: "libevent not found"
Cleaning up file based variables
ERROR: Job failed: exit code 1