Don't rely on immediate_quit in command_line_input
AFAICS, immediate_quit was only needed here nowdays to be able to
interrupt gdb_readline_no_editing.
command_line_input can also take the gdb_readline_wrapper path, but
since that is built on top of the event loop (gdb_select / poll and
asynchronous signal handlers), it can be interrupted.
gdb/ChangeLog:
2016-04-12 Pedro Alves <palves@redhat.com>
* top.c: Include "gdb_select.h".
(gdb_readline_no_editing): Wait for input with gdb_select instead
of blocking in fgetc.
(command_line_input): Don't set immediate_quit.
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