[RFAv2] Show locno for 'multi location' breakpoint hit msg+conv var $bkptno $locno.

[Eli Zaretskii]

> From: Philippe Waroquiers <philippe.waroquiers@skynet.be>
> Cc: gdb-patches@sourceware.org
> Date: Sun, 05 Jun 2022 21:44:27 +0200
> 
> > Does "M-x gdb" in Emacs still work correctly after this change,
> > including the display in the breakpoints buffer?
> I do not see behavior changes between GDB master and GDB with this patch.
> But the display of multiple code locations in the breakpoint buffer
> seems to not work properly, for both the non modified master
> and the gdb with this patch.

Thanks, something to fix in Emacs, I guess.