Changes since 2.4.2:

• Fix trace mode on macOS High Sierra 10.13.3
  (#55575, raimue in 995dde8)

• Using subport= with a nonexistent subport causes an error.
  (#34619, jmr in 9c48520)

• livecheck.regex is matched case-insensitive.
  (khindenburg in 0310feb)

• Sandbox allows read/write access to /dev/{u,}random.
  (jmr in c8c1565)

• Sandbox allows write access to /var/db/mds.
  (#50469, cal in 1f76522)