bug#62407: 30.0.50; The command to run elixir-ls on Windows is `language_server.bat`

[Eli Zaretskii]

> From: 牟 桐 <mou.tong@outlook.com>
> CC: "62407@debbugs.gnu.org" <62407@debbugs.gnu.org>
> Date: Fri, 24 Mar 2023 07:18:24 +0000
> 
> > Btw, is language_server.bat part of that server's distribution, or did you 
> > write the batch file yourself?
> 
> The former, `language_server.bat` is shipped with the distribution.
> 
> > Can you see if the patch below solves your problem?
> 
> It will raise an error, so I changed it like this, now it solves my problem:
> 
>     ((elixir-mode elixir-ts-mode heex-ts-mode)
>      . ,(if (and (fboundp 'w32-shell-dos-semantics)
>                  (w32-shell-dos-semantics))        
>             '("language_server.bat")        
>           '("language_server.sh")))         

Right, sorry about that.

João, okay to install on the master branch?