[packages/setup] go back to joinpasswd in %post

[Elan Ruusamäe]

On 11.04.2021 00:31, atler wrote:
> commit 841dc2f529959132861e802fb35d409048e8659d
> Author: Jan Palus <atler at pld-linux.org>
> Date:   Sat Apr 10 22:21:12 2021 +0200
>
>      go back to joinpasswd in %post
>      
>      %triggerpostun is way too late at least with rpm4.

to be clear, do you really mean any rpm4 (rpm 4.5, 4.6 by rpm5.org) or 
actually rpm 4.16 (by rpm.org)?

should use 4.16+ in terminology, or say use the negative expression to 
exclude rpm versions by rpm5.org

i.e "non-rpm5" to denote versions by rpm.org. altho, rpm.org/rpm5.org is 
pretty clear too