bug#45611: 28.0.50; xterm.c compile anomaly and link failure

[Eli Zaretskii]

> From: William C Doughty III <n2ocm@optonline.net>
> Cc: 45611@debbugs.gnu.org
> Date: Sat, 02 Jan 2021 11:49:08 -0500
> 
> > Strange, it looks like the test for XRender was not done at all...
> > On my system that test is between these two:
> >
> >> checking for inotify_init1... yes
> >> checking for cairo >= 1.8.0... yes
> >
> > It says:
> >
> >   checking for XRenderQueryExtension in -lXrender... yes
> >
> > Why isn't that test being run on your system?
> 
> Your guess is as good ( or better ) than mine. I'm not too
> familiar with how these scripts work. And as far as config.log
> the check for XRenderQueryExyension in -lXrender it's not there
> at all.
> 
> I just checked the version of autoconf. It's 2.69. So either
> This commit borked the config setup. Or somthing else is going
> on. As I said backing out this commit make the config and
> compile happy. BTW. this commit was the last I saw that
> affected configure.ac

I'm not sure this is the culprit.  At least on my system, I still see
the test for Xrender after that commit.