Since setitimer is not implemented in Serenity we use alarm which
triggers SIGALRM after the timeout. We also don't use a signal handler
as we are doing things that serenity doesn't like/doesn't allow.
Linux dealt with allocating and writing in a signal handler but it is
undefined, so instead we just let the process die by SIGALRM.
This means we instead of reading the output can detect timeouts by
checking how the process died.
For now this is a lagom only application as it is not compatible with
serenity in its current state.
The only change is that it is released under a different license with
permission from all the authors.