bug#37527: [PATCH] Install C source code for for debugging help

[Eli Zaretskii]

> From: Paul Eggert <eggert@cs.ucla.edu>
> Date: Thu, 26 Sep 2019 13:07:52 -0700
> Cc: Paul Eggert <eggert@cs.ucla.edu>
> 
> Without this change, on typical GNU/Linux distributions
> like Debian, the first button of ‘C-h f car RET’ does not
> work because the source code for ‘car’ is not installed.

It prompts for the source directory, doesn't it?

> Fix this by installing the (compressed) C source code along with
> the (compressed) Lisp source code that is already installed.
> This adds about 3 MB (about 2%) to the size of the installed files
> on my platform.

As mentioned on emacs-devel, if the consensus is to install this, I'd
like to postpone doing so until the emacs-27 branch is cut.