[gnutls-devel] GnuTLS | Add CI tarball build (!809)

[Development of GNU's TLS library]

Tim Rühsen commented on a discussion on tests/scripts/common.sh:

>  }
>  
>  # Find a port number not currently in use.
> -GETPORT='rc=0; myrandom=$(date +%N | sed s/^0*//)
> +GETPORT='rc=0; unset myrandom
> +    if test -n "$RANDOM"; then myrandom=$(($RANDOM + $RANDOM)); fi
> +    if test -z "$myrandom"; then myrandom=$(date +%N | sed s/^0*//); fi
> +    if test -z "$myrandom"; then myrandom=0; fi

That's a fallback in case we can't get a random value. It means that we try getting an unused port based starting at `PID % 63001 + 2000`, which is IMO quite OK.

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