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

[Nicholas D Steeves]

On Sat, Jul 28, 2018 at 05:06:39PM -0400, Nicholas D Steeves wrote:
> 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

Oh, and it seems to be unmaintained upstream, and only available on
emacswiki...