Switch from USE_RCORDER to USE_RC_SUBR as prodded by dougb.
Note: To preserve the prior functionality it is recommended that
early_late_divider be set to something VERY early in the boot process
such as sysctl.
I suspect no one by myself actually used this port in practice so
mark it DEPRECATED and set an expiration date of September 1. Of some
is using it, let me know and I'll remove the DEPRECATION.