qemu-io: use readline.c
Use readline.c for command-line history. There was support for GNU Readline and BSD Editline but it was never compiled in. Since QEMU has its own readline.c, just use that when qemu-io runs with stdin attached to a terminal. Signed-off-by: NStefan Hajnoczi <stefanha@redhat.com> Signed-off-by: NKevin Wolf <kwolf@redhat.com>
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