bug#67480: 30.0.50; Cannot start eglot

[Mou Tong]

 1. `emacs -Q`

 2. Open a src file and `M-x eglot`

 3. Get the following message:

 ```

 Loading project (native compiled elisp)...done

 Loading eldoc (native compiled elisp)...done

 Loading seq (native compiled elisp)...done

 Loading flymake (native compiled elisp)...done

 Loading xref (native compiled elisp)...done

 Loading jsonrpc (native compiled elisp)...done

 Loading external-completion (native compiled elisp)...done

 Unbound slot: eglot-lsp-server, "#<eglot-lsp-server

 eglot-lsp-server-1feea1d8dd60>", -events-buffer, oref

 error in process filter: Unbound slot: eglot-lsp-server,

 "#<eglot-lsp-server eglot-lsp-server-1feea1d8dd60>", -events-buffer, oref

 [2 times]

 ```

 I tested `.c` using `c-mode` or `c-ts-mode`, `.rs` with `rust-ts-mode`,

 all of them show the above error, so I guess it's not major mode's problem.

---

In GNU Emacs 30.0.50 (build 1, x86_64-apple-darwin21.6.0, NS

 appkit-2113.60 Version 12.7.1 (Build 21G920)) of 2023-11-27 built on

 dalum.local

Repository revision: 2407f810136739da376ff0929b247a49dc196299

Repository branch: master

Windowing system distributor 'Apple', version 10.3.2113

System Description:  macOS 12.7.1

Configured using:

 'configure --with-native-compilation=aot'

Configured features:

ACL DBUS GIF GLIB GMP GNUTLS JPEG JSON LCMS2 LIBXML2 MODULES NATIVE_COMP

NOTIFY KQUEUE NS PDUMPER PNG RSVG SQLITE3 THREADS TIFF

TOOLKIT_SCROLL_BARS TREE_SITTER WEBP XIM ZLIB

Important settings:

  value of $LC_COLLATE: C

  value of $LANG: en_US.UTF-8

  locale-coding-system: utf-8-unix

Major mode: C/*