* lisp/emacs-lisp/package.el: Don't activate packages older than builtin.
(package-obsolete-list): Rename from package-obsolete-alist, and make it into a simple list of package-desc. (package-strip-version): Remove. (package-built-in-p): Use package--builtin-versions. (package-mark-obsolete): Simplify. (package-process-define-package): Mark it obsolete if older than the builtin version. (package-handle-response): Use line-end-position. (package-read-archive-contents, package--download-one-archive): Simplify. (package--add-to-archive-contents): Skip if older than the builtin or installed version. (package-menu-describe-package): Fix last change. (package-list-unversioned): New var. (package-menu--generate): Use it. * lisp/Makefile.in (autoloads): Set autoload-builtin-package-versions. * lisp/startup.el (package--builtin-versions): New var. (package-subdirectory-regexp): Remove. (package--description-file): Hard code its value instead. * lisp/emacs-lisp/autoload.el: Manage package--builtin-versions. (autoload--insert-text, autoload--insert-cookie-text): New functions. (autoload-builtin-package-versions): New variable. (autoload-generate-file-autoloads): Use them. Remove the list of autoloaded functions/macros from the (autoload...) comments.
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