Remove broken GCC 7.1 GCJ manual links

[Gerald Pfeifer]

Hi Krisztian,

On Thu, 29 Jun 2017, PaczĂĄri KrisztiĂĄn wrote:
> GCJ has been removed from GCC 7.1, so these broken links should also be 
> removed from the documentation page (https://gcc.gnu.org/onlinedocs/) 
> and probably from the scripts generating them: "GCC 7.1 GCJ Manual (also 
> in PDF or PostScript or an HTML tarball)"

thanks for the heads-up.  Just to confirm that Jakub has addressed
this two weeks ago.  If you seen anything left or anything else, please
advise.

Gerald