Enable the PR_SET_CHILD_SUBREAPER prctl(2) option on Linux.

This prctl(2) option can be used to set the "child subreaper" attribute
of the calling process.  This allows a process to take on the role of
'init', which means the process will inherit descendant processes when
their immediate parent terminates.

This will be used in an upcoming commit that uses a double fork(2) +
unshare(2) to create a new PID namespace.  The parent from the second
fork will terminate leaving the child process to be inherited by 'init'.
Aside from it being better to maintain the parent/child relationships
between the various unit processes, without setting this you need to ^C
twice to fully quit unit when running in the foreground after the double
fork.

Reviewed-by: Alejandro Colomar <alx@nginx.com>
Signed-off-by: Andrew Clayton <a.clayton@nginx.com>

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