Get rid of implicit declaration of function warning

--- exp_win.c.orig	Thu Sep  9 18:41:48 2010
+++ exp_win.c	Thu Sep  9 18:42:53 2010
@@ -39,7 +39,7 @@ conflicts with sys/ioctl.h
 /* Sigh.  On AIX 2.3, termios.h exists but does not define TIOCGWINSZ */
 /* Instead, it has to come from ioctl.h.  However, As I said above, this */
 /* can't be cavalierly included on all machines, even when it exists. */
-#if defined(HAVE_TERMIOS) && !defined(HAVE_TIOCGWINSZ_IN_TERMIOS_H)
+#if (defined(HAVE_TERMIOS) && !defined(HAVE_TIOCGWINSZ_IN_TERMIOS_H)) || defined(__OpenBSD__)
 #  include <sys/ioctl.h>
 #endif
 
