(gdb-inferior-io-mode-map): Remove (unused).

(gdb-inferior-io-mode-map): Remove (unused).
(gdb-inferior-io-mode): Use define-minor-mode.
(gdb-source-info): Don't burp if there's no source file.
(gdb-inferior-io-interrupt, gdb-inferior-io-quit)
(gdb-inferior-io-stop, gdb-inferior-io-eof)
(gdb-display-breakpoints-buffer, gdb-frame-breakpoints-buffer)
(gdb-display-stack-buffer, gdb-frame-stack-buffer)
(gdb-display-registers-buffer, gdb-frame-registers-buffer)
(gdb-display-locals-buffer, gdb-frame-locals-buffer)
(gdb-display-display-buffer, gdb-frame-display-buffer)
(gdb-display-gdb-buffer, gdb-frame-gdb-buffer)
(gdb-display-assembler-buffer, gdb-frame-assembler-buffer):
Remove the spurious left over arg from the "big reorg".