* lisp/widget.el:
* lisp/w32-fns.el:
* lisp/textmodes/fill.el:
* lisp/term/common-win.el:
* lisp/scroll-bar.el:
* lisp/rfn-eshadow.el:
* lisp/menu-bar.el:
* lisp/language/tibetan.el:
* lisp/language/thai.el:
* lisp/language/misc-lang.el:
* lisp/language/lao.el:
* lisp/language/korean.el:
* lisp/language/japanese.el:
* lisp/language/indian.el:
* lisp/language/hebrew.el:
* lisp/language/european.el:
* lisp/language/ethiopic.el:
* lisp/language/english.el:
* lisp/language/cyrillic.el:
* lisp/language/chinese.el:
* lisp/jka-cmpr-hook.el:
* lisp/international/ucs-normalize.el:
* lisp/international/mule.el:
* lisp/international/mule-conf.el:
* lisp/international/iso-transl.el:
* lisp/international/fontset.el:
* lisp/international/characters.el:
* lisp/format.el:
* lisp/facemenu.el:
* lisp/electric.el:
* lisp/dos-w32.el:
* lisp/dos-fns.el:
* lisp/disp-table.el:
* lisp/cus-face.el:
* lisp/composite.el:
* lisp/bindings.el:
* admin/unidata/blocks.awk:
* admin/charsets/eucjp-ms.awk:
* admin/charsets/cp51932.awk: Use `lexical-binding`.

From a patch privately suggested by Mattias Engdegård on 2020-05-11
in a followup to Bug#40671.
* admin/charsets/cp51932.awk:
* admin/charsets/eucjp-ms.awk:
Generate code that does not modify constant conses.
* doc/misc/emacs-mime.texi (Encoding Customization):
* lisp/emacs-lisp/byte-opt.el (byte-compile-side-effect-free-ops):
* lisp/frameset.el (frameset-persistent-filter-alist):
* lisp/gnus/gnus-sum.el (gnus-article-mode-line-format-alist):
Use append instead of nconc.
* lisp/language/japanese.el (japanese-ucs-cp932-to-jis-map)
(jisx0213-to-unicode):
Use mapcar instead of mapc.
* lisp/language/lao-util.el (lao-transcription-consonant-alist)
(lao-transcription-vowel-alist):
* lisp/language/tibetan.el (tibetan-subjoined-transcription-alist):
Use copy-sequence.
* test/src/fns-tests.el (fns-tests-nreverse):
(fns-tests-sort, fns-tests-collate-sort)
(fns-tests-string-version-lessp, fns-tests-mapcan):
Use copy-sequence, vector, and list.

This mostly changes http: to https: in URLs.  It also updates
some URLs that have moved, removes some URLs that no longer
work, recommends against using procmail (procmail.org no
longer works), and removes some mentions of the
no-longer-existing Gmane, LPF and VTW.
It doesn't update all URLs, just the ones I had time for.
* GNUmakefile (help):
* admin/admin.el (manual-doctype-string):
* admin/charsets/Makefile.in (${charsetdir}/ALTERNATIVNYJ.map):
* admin/charsets/mapconv:
* lisp/net/soap-client.el (soap-create-envelope):
* lisp/org/org.el (org-doi-server-url):
* lisp/textmodes/bibtex.el (bibtex-generate-url-list):
Prefer https: to http: un URLs.

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.

Prefer straight quotes in random script files, as they are not converted.
Prefer grave quotes in a couple of places in the manual that were missed
earlier, as these quotes are converted.

* admin/charsets/cp51932.awk, admin/charsets/eucjp-ms.awk:
Don't set no-byte-compile in the outputs.

* lisp/loadup.el: Don't specify uncompiled cp51932, eucjp-ms.

* lisp/loadup.el: Explicitly load cp51932 and eucjp-ms.
* lisp/language/japanese.el: Use require rather than load.
* lisp/international/cp51932.el, lisp/international/eucjp-ms.el:
Provide a feature.
* admin/charsets/eucjp-ms.awk, admin/charsets/cp51932.awk:
Provide a feature in the generated file.