syscall package is locked down - need switch to x/sys/unix

[gen2thomas]

This affects the i2c part of gobot and also indirect the gpio part, if using gpiod implementation. Currently appveyour build is not working. This should maybe resolved together.

https://go.googlesource.com/proposal/+/refs/heads/master/design/freeze-syscall.md

Unix:
https://pkg.go.dev/golang.org/x/[email protected]/unix#section-readme

In general:
https://pkg.go.dev/golang.org/x/sys

What is the state of syscall vs. x/sys?

for example: https://github.com/fsnotify/fsnotify