bug#6013: [cperl-mode] cperl-perldoc doesn't work anymore with file test operators like -e

[Eli Zaretskii]

> From: Stefan Kangas <stefan@marxist.se>
> Date: Fri, 5 Jul 2019 21:10:28 +0200
> Cc: 6013@debbugs.gnu.org
> 
> LanX <lanx.perl@googlemail.com> writes:
> 
> > Hi
> >
> > cperl-mode can't call perldocs for functions with a hyphen anymore like 
> > "-e" or "-X"
> >
> > (cperl-perldoc "-e") or "M-x cperl-perldoc RET -e" result to
> >    "error in process sentinel: Man-bgproc-sentinel: Can't find the -e 
> > manpage"
> >
> > But perldoc -f -e works fine in the shell, and as far as I can see from the 
> > sources of cperl-mode "-e" this case is covered to be mapped on the -f 
> > switch.
> >
> > Tested on 23 and 22 from two different users on different continents.
> >
> > Cheers
> >   Rolf
> 
> I can confirm this bug, and have attached a fix.

Thanks, pushed to the master branch.