Add constants from linux/keyctl.h

Move linux/reboot.h constants into linux module

Solarish: missing declaration of port_send and port_sendn

Add `CLOCK_TAI` to linux_like/mod.rs

Add MINSIGSTKSZ and SIGSTKSZ definitions for MacOS

Add IP6T_SO_* options definition

Add wait4 for macOS and FreeBSD

Add definitions for cgroupfs and cgroup2fs MAGIC

Remove non tier 1 apple targets

Add some linux socket MTU constants

<sys/timex.h>

Re-enable semver check

Remove ref config

Fix config

Try to use `fix-azure` branch

Remove some FIXME