Remove gdb-gdb.gdb breakpoint on disappeared function info_command.

Remove gdb-gdb.gdb breakpoint on disappeared function info_command.

The function info_command has disappeared, so this breakpoint does not
work anymore.
"info_command" was a function for the prefix command "info",
giving the list of "info" subcommands.
It is not very clear what the removed breakpoint and its associated
command list was supposed to do.

Removed and pushed as obvious, after discussion with Tom.