os-posix: remove useless ioctlsocket() define

The API is specific to win32.

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Message-Id: <20230221124802.4103554-16-marcandre.lureau@redhat.com>

include/sysemu/os-posix.h

@@ -52,7 +52,6 @@ void os_setup_post(void);
 int os_mlock(void);
 
 #define closesocket(s) close(s)
-#define ioctlsocket(s, r, v) ioctl(s, r, v)
 
 int os_set_daemonize(bool d);
 bool is_daemonized(void);