bug#58847: Patch to properly parse c++11 multiline strings

[Eli Zaretskii]

> Date: Fri, 28 Oct 2022 16:13:42 -0400
> From:  Jan Stranik via "Bug reports for GNU Emacs,
>  the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org>
> 
> I’m happy user of emacs and ebrowse feature. Recently I noticed that ebrowse 
> does not work for multi-line strings in c++. 
> The r-string parsing is on also for c files, but it does not matter since c 
> does not have r strings. 

This patch is long enough for us to require that you assign the
copyright for your code to the FSF.  Would you be willing start your
legal paperwork at this time, so that we could accept your
contribution?  If so, I will send you the form to fill and the
instructions to email it.

Thanks.