osdep.h: For Haiku, define SIGIO as equivalent to SIGPOLL
Haiku doesn't provide SIGIO; fix this up in osdep.h by defining it as equal to SIGPOLL. Signed-off-by: NDavid Carlier <devnexen@gmail.com> Reviewed-by: NPeter Maydell <peter.maydell@linaro.org> Reviewed-by: NThomas Huth <thuth@redhat.com> Signed-off-by: NPeter Maydell <peter.maydell@linaro.org> Message-id: 20200703145614.16684-6-peter.maydell@linaro.org [PMM: Expanded commit message] Reviewed-by: NPeter Maydell <peter.maydell@linaro.org> Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>
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