bug#50331: 28.0.50; Propose to obsolete cwarn.el

[Eli Zaretskii]

> From: Zhiwei Chen <condy0919@gmail.com>
> Date: Thu, 02 Sep 2021 14:30:44 +0800
> Cc: andlind@gmail.com
> 
> # conclusion
> 
> Since the first two cases are not existent, and the last one is false
> positive (IMO), I propose to obsolete cwarn.

I don't understand how you arrived at that conclusion.  cwarn provides
the diagnostics while you write the code, without any need to invoke
the compiler, and potentially long before you submit the code to the
compiler.  Some people might prefer that, so why inconvenience them?