x11/xf86-input-ws is broken for NetBSD 9

[Mustafa Dogan <mustafa%dogan.biz.tr@localhost>]

Hi,
On NetBSD 9 pkgsrc/x11/xf86-input-ws i,s broken for two months (and modular-xorg-drivers and modular-xorg also broken). Because, NetBSD 9 doesn't have WSCONS_EVENT_HSCROLL and WSCONS_EVENT_VSCROLL (but NetBSD current has for 10 months).

To be able to compile xf86-input-ws, I modified pkgsrc/x11/xf86-input-ws/patches/patch-src_ws.c
Can anyone submit changes below (or alternative solution for the problem)?
Thanks,
Mustafa Dogan

@@ -611,17 +610,23 @@ wsReadHwState(InputInfoPtr pInfo, wsHwSt
                case WSCONS_EVENT_MOUSE_ABSOLUTE_W:
                        /* ignore those */
                        continue;
+#ifdef WSCONS_EVENT_SYNC
                case WSCONS_EVENT_SYNC:
                        DBG(4, ErrorF("Sync\n"));
                        return TRUE;
+#endif
+#ifdef WSCONS_EVENT_HSCROLL
                case WSCONS_EVENT_HSCROLL:
                        hw->hscroll = event->value;
                        DBG(4, ErrorF("Horiz. Scrolling %d\n", event->value));
                        return TRUE;
+#endif
+#ifdef WSCONS_EVENT_VSCROLL
                case WSCONS_EVENT_VSCROLL:
                        hw->vscroll = event->value;
                        DBG(4, ErrorF("Vert. Scrolling %d\n", event->value));
                        return TRUE;
+#endif
                default: