bug#65666: Lockfiles break package-vc-install-from-checkout

[Eli Zaretskii]

> Cc: Philip Kaludercic <philipk@posteo.net>, Adam Porter <adam.porter@47ap.net>
> Date: Thu, 31 Aug 2023 14:47:48 -0700
> From:  Joseph Turner via "Bug reports for GNU Emacs,
>  the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org>
> 
> To reproduce: clone a repo, ensure that create-lockfiles is non-nil,
> edit a source file in the repo but do not save it, run
> package-vc-install-from-checkout on the repo.
> 
> Backtrace:
> 
> Debugger entered--Lisp error: (file-missing 
> "/home/joseph/.emacs.d/elpa/hyperdrive/.#hyperdrive.el")
>   
> comp-el-to-eln-filename("/home/joseph/.emacs.d/elpa/hyperdrive/.#hyperdrive.el")

We should not try to native-compile lock files, obviously.  Some code
naïvely uses "*.el" to find all the Lisp files; it should filter out
lock files.

P.S. Please always say in what version of Emacs you see the problem
you report.  Bonus points for including all of the information
collected by report-emacs-bug about your system and Emacs
configurations.