Add new user option lock-file-name-transforms
* doc/emacs/files.texi (Interlocking): Mention lock-file-name-transforms. * doc/lispref/files.texi (File Locks): Document lock-file-name-transforms. * doc/misc/efaq.texi (Not writing files to the current directory): Mention all the three variables needed to not having Emacs writing files to the current directory in one place. * lisp/files.el (lock-file-name-transforms): New user option (bug#49261). (make-auto-save-file-name): Factor out the main logic... (auto-save--transform-file-name): ... to this new function. (make-lock-file-name): New function that also calls the factored-out function. * src/filelock.c: Remove MAKE_LOCK_NAME and fill_in_lock_file_name. (make_lock_file_name): New utility function that calls out to Lisp to heed `lock-file-name-transforms'. (lock_file): Use it. Also remove likely buggy call to dostounix_filename. (unlock_file_body, Ffile_locked_p): Also use make_lock_file_name.
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