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 07:47:54 +0000
> 
> 
> BTW, elixir's lsp installed by brew on Mac is `elixir-ls`, a soft link
> to `language_server.sh`.
> 
> I don't have a linux computer, so I don't know what the command is on
> Linux.
> 
> Should we use a unified name in Eglot like `elixir-ls` (which is the
> user's job to name their elixir's lsp), or keep using `language_server`,
> which may leading to conflict on system wide.
> 
> I guess the best way to solve this is to let elixir-ls's dev rename
> their release :)

I think we should invoke the server as the developers tell us.