Merge from Gnulib

Merge from Gnulib

This is mostly to change http: to https: in licenses.
* COPYING, build-aux/config.guess, build-aux/config.sub:
* doc/emacs/doclicense.texi, doc/emacs/gpl.texi:
* doc/lispintro/doclicense.texi, doc/lispref/doclicense.texi:
* doc/lispref/gpl.texi, doc/misc/doclicense.texi:
* doc/misc/gpl.texi, etc/COPYING, leim/COPYING:
* lib-src/COPYING, lib/COPYING, lisp/COPYING, lwlib/COPYING:
* msdos/COPYING, nt/COPYING, src/COPYING:
Copy from Gnulib.