bug#18411: No .gbdinit file in src/ directory

[Eli Zaretskii <eliz@gnu.org>]

> From: Joseph Mingrone <jrm@ftfl.ca>
> Date: Fri, 05 Sep 2014 13:47:16 -0300
> Cc: 18411@debbugs.gnu.org
> 
> jrm@gly /usr/ports/editors/emacs/work/emacs-24.3/src % gdb /usr/local/share/emacs /usr/coredumps/emacs-24.3.core.1001.0
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> /usr/local/share/emacs: No such file or directory.
> [New process 100142]
> Core was generated by `emacs-24.3'.
> Program terminated with signal SIGABRT, Aborted.
> #0  0x34d60caf in ?? ()
> .gdbinit:19: Error in sourced command file:
> No symbol table is loaded.  Use the "file" command.
> (gdb) xbacktrace
> Undefined command: "xbacktrace".  Try "help".
> (gdb)

I don't think xbacktrace can work on a core file, as it needs a
running program (it calls functions inside Emacs).