Use lexical-binding in all the lisp/obsolete/*.el files.
While at it, removed redundant :group arguments and used #' to quote
functions.  Commented out the key bindings which the #' revealed
to lead to non-existing commands, and replaced those revealed to be obsolete.

* lisp/obsolete/cl-compat.el: Use cl-lib.

* lisp/obsolete/cust-print.el: Assume `defalias` exists.
(with-custom-print): Use `declare`.

* lisp/obsolete/iswitchb.el (iswitchb-init-XEmacs-trick)
(iswitchb-xemacs-backspacekey): Remove functions.

* lisp/obsolete/landmark.el (landmark, landmark-nslify-wts):
Prefer `apply` to `eval`.

* lisp/obsolete/longlines.el (longlines-mode): Don't use `add-to-list`
on a hook.

* lisp/obsolete/pgg-gpg.el (pgg-gpg-process-region): Use `clear-string`.

* lisp/obsolete/pgg-pgp.el (pgg-pgp-encrypt-region): Remove oddly
unused var `passphrase`.
(pgg-pgp-verify-region): Declare var `jam-zcat-filename-list`.

* lisp/obsolete/pgg-pgp5.el (pgg-pgp5-encrypt-region): Remove oddly
unused var `passphrase`.
(pgg-pgp5-verify-region): Declare var `jam-zcat-filename-list`.

* lisp/obsolete/pgg.el: Remove some XEmacs compatibility code.
(pgg-run-at-time, pgg-cancel-timer, pgg-clear-string): Remove functions.
Use their core equivalent instead.

* lisp/obsolete/rcompile.el (remote-compile): Remove unused vars `l`,
`l-host`, `l-user`, and `localname`.

* lisp/obsolete/starttls.el (starttls-any-program-available):
Use `define-obsolete-function-alias`.

* lisp/obsolete/tls.el (tls-format-message): Delete function, use
`format-message` instead.

* lisp/obsolete/url-ns.el (url-ns-prefs): Use `with-current-buffer`
and `dlet`.

* lisp/obsolete/vip.el (vip-escape-to-emacs): Remove unused var `key`.
(vip-command-argument, vip-read-string, ex-delete, ex-line): Remove
unused var `conditions`.
(ex-map): Use a closure instead of `eval`.
(ex-set): Make it an alias of `set-variable`.
(ex-substitute): Remove unused var `cont`.

* lisp/obsolete/abbrevlist.el:
* lisp/obsolete/bruce.el:
* lisp/obsolete/cc-compat.el:
* lisp/obsolete/cl-compat.el:
* lisp/obsolete/cl.el:
* lisp/obsolete/complete.el:
* lisp/obsolete/crisp.el:
* lisp/obsolete/cust-print.el:
* lisp/obsolete/erc-compat.el:
* lisp/obsolete/erc-hecomplete.el:
* lisp/obsolete/eudcb-ph.el:
* lisp/obsolete/fast-lock.el:
* lisp/obsolete/gs.el:
* lisp/obsolete/gulp.el:
* lisp/obsolete/html2text.el:
* lisp/obsolete/info-edit.el:
* lisp/obsolete/iswitchb.el:
* lisp/obsolete/landmark.el:
* lisp/obsolete/lazy-lock.el:
* lisp/obsolete/longlines.el:
* lisp/obsolete/mailpost.el:
* lisp/obsolete/mantemp.el:
* lisp/obsolete/meese.el:
* lisp/obsolete/messcompat.el:
* lisp/obsolete/metamail.el:
* lisp/obsolete/mouse-sel.el:
* lisp/obsolete/nnir.el:
* lisp/obsolete/old-emacs-lock.el:
* lisp/obsolete/otodo-mode.el:
* lisp/obsolete/patcomp.el:
* lisp/obsolete/pc-mode.el:
* lisp/obsolete/pc-select.el:
* lisp/obsolete/pgg-def.el:
* lisp/obsolete/pgg-gpg.el:
* lisp/obsolete/pgg-parse.el:
* lisp/obsolete/pgg-pgp.el:
* lisp/obsolete/pgg-pgp5.el:
* lisp/obsolete/pgg.el:
* lisp/obsolete/rcompile.el:
* lisp/obsolete/s-region.el:
* lisp/obsolete/sb-image.el:
* lisp/obsolete/sregex.el:
* lisp/obsolete/starttls.el:
* lisp/obsolete/sup-mouse.el:
* lisp/obsolete/terminal.el:
* lisp/obsolete/tls.el:
* lisp/obsolete/tpu-edt.el:
* lisp/obsolete/tpu-extras.el:
* lisp/obsolete/tpu-mapper.el:
* lisp/obsolete/url-ns.el:
* lisp/obsolete/vc-arch.el:
* lisp/obsolete/vi.el:
* lisp/obsolete/vip.el:
* lisp/obsolete/ws-mode.el:
* lisp/obsolete/yow.el: Use lexical-binding.

Run "TZ=UTC0 admin/update-copyright".

Run "TZ=UTC0 admin/update-copyright $(git ls-files)".

Run 'TZ=UTC0 admin/update-copyright $(git ls-files)'.

Run admin/update-copyright.

Most of this change is to boilerplate commentary such as license URLs.
This change was prompted by ftp://ftp.gnu.org's going-away party,
planned for November.  Change these FTP URLs to https://ftp.gnu.org
instead.  Make similar changes for URLs to other organizations moving
away from FTP.  Also, change HTTP to HTTPS for URLs to gnu.org and
fsf.org when this works, as this will further help defend against
man-in-the-middle attacks (for this part I omitted the MS-DOS and
MS-Windows sources and the test tarballs to keep the workload down).
HTTPS is not fully working to lists.gnu.org so I left those URLs alone
for now.

(html2text-clean-anchor): Mark unused arg.