* Add GHA workflow to run test_crosscompile and go test
* crosscompile job doesn't need setup-go
* Test more go versions
* Test 1.6
* Remove 1.13 and add comment of testing strategy
Add _IOC macros (<sys/ioccom.h>, <asm-generic/ioctl.h>) for linux and bsd's, unify ioctl() calls.
FreeBSD: use modern pts(4) interface instead of the old pty(4) one