Make STEED unconditional.

src/polyself.c

@@ -691,7 +691,6 @@ int	mntmp;
 
 	if (!sticky && !u.uswallow && u.ustuck && sticks(youmonst.data)) u.ustuck = 0;
 	else if (sticky && !sticks(youmonst.data)) uunstick();
-#ifdef STEED
 	if (u.usteed) {
 	    if (touch_petrifies(u.usteed->data) &&
 		    !Stone_resistance && rnl(3)) {
@@ -704,7 +703,6 @@ int	mntmp;
 	    }
 	    if (!can_ride(u.usteed)) dismount_steed(DISMOUNT_POLY);
 	}
-#endif
 
 	if (flags.verbose) {
 	    static const char use_thec[] = "Use the command #%s to %s.";