Changes to sarpi-hacks pkg

Please be aware the sarpi-hacks pkg has been modified and will no longer attempt to detect any installed RTCs or add a command to '/etc/rc.d/rc.local' to set the Slackware ARM system time from a NTP server at boot.

These changes came into effect on 17 January 2021 and the sarpi-hacks.README file has been updated accordingly to show this.