v2.0.17: Switch to golang.org/x/sys/svc from Conformal fork

v2.0.16: Switch back to upstream gspt

v2.0.15: Move dupfd, caps to svcutils

v2.0.14: Move utility code to svcutils

v2.0.13: Allow logging to stderr when running under systemd.

v2.0.12: Fix systemd, cleanup

v2.0.11: Fix for linux/arm64

v2.0.10: Increase OS compatibility.

v2.0.9: Add cgo-less reduced functionality mode