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: David Carlier <[email protected]>
Reviewed-by: Peter Maydell <[email protected]>
Reviewed-by: Thomas Huth <[email protected]>
Signed-off-by: Peter Maydell <[email protected]>
Message-id: [email protected]
[PMM: Expanded commit message]
Reviewed-by: Peter Maydell <[email protected]>
Signed-off-by: Peter Maydell <[email protected]>

Author: devnexen

include/qemu/osdep.h

@@ -432,6 +432,10 @@ void qemu_anon_ram_free(void *ptr, size_t size);
 #define HAVE_CHARDEV_PARPORT 1
 #endif
 
+#if defined(__HAIKU__)
+#define SIGIO SIGPOLL
+#endif
+
 #if defined(CONFIG_LINUX)
 #ifndef BUS_MCEERR_AR
 #define BUS_MCEERR_AR 4