Bug#904845: drop protbuf.el because built-in emacs-lock-mode provides this functionality?

[Nicholas D Steeves]

Source: emacs-goodies-el
Version: 39.0
Severity: normal

It seems like protbuf.el can be dropped, because "Emacs Lock is
included in Emacs 24."
  https://www.emacswiki.org/emacs/ProtectingBuffers