Merge from origin/emacs-27

5b7d226779 * etc/AUTHORS: Update.
4aa758e53d ; ChangeLog.3 update
9261b1ed49 * admin/authors.el (authors-ignored-files): Fix entries.
86e4da6eaf ; ChangeLog.3 update
009c6a1767 ; ChangeLog.3 fixes
f9e53947c7 Fix documented slot name of eieio-instance-tracker class
999d75c0c1 Range-check width passed to define-fringe-bitmap
29e415d6b0 ; ChangeLog.3 fixes
4653baa6a5 ; ChangeLog.3 update & fixes.
a95ec6e060 * admin/authors.el: Add missing entries
af519a6348 Define libgnutls-version properly
9ec6eb1065 vc-dir-ignore: More accurately choose base directory
e74fb4688b * lisp/emacs-lisp/cursor-sensor.el (cursor-sensor--detect)...
3bce7ec382 CC Mode: Protect against consecutive calls to before-chang...

diff --cc lisp/progmodes/cc-mode.el
Simple merge

diff --cc lisp/vc/vc.el
Simple merge