bug#50006: 28.0.50; remove deprecated option erc-send-pre-hook

[Stefan Kangas]

"J.P." <jp@neverwas.me> writes:

> Tags: patch
> Severity: minor
>
> I don't actually need this for any of the more delusional mega patches I
> currently have on offer [1], so feel free to flat out deny. (However, I
> will say that it does unclutter some of the main message-sending
> business, which may not be the worst thing ever.)
>
> Note: I guess we should probably double check this doesn't interfere
> with any of the ELPA plans that ERC's maintainer has cooking. Thanks.
>
>
> [1] https://debbugs.gnu.org/cgi/bugreport.cgi?bug=48598
>     https://debbugs.gnu.org/cgi/bugreport.cgi?bug=49860

Copying in the ERC maintainer Amin Bandali here.

Amin, could you help review this patch?