quassel-irssi: drop this package

quassel-irssi: drop this package

Based on the discussion on GitHub [1], we found out that quassel irssi is not maintained anymore, thus it is dead and confirmed by developers [2]. There is no reason to keep this package anymore here in our repositories, because otherwise we will need to take care of it and thats not what is going to happen.

[1] https://github.com/openwrt/packages/pull/22605
[2] https://github.com/phhusson/quassel-irssi/issues/36

Signed-off-by: Josef Schlehofer <redacted>