add new methods to class

git-svn-id: http://svn2.nishi.boats/svn/milsko/trunk@167 b9cfdab3-6d41-4d17-bbe4-086880011989

src/widget/vulkan.c

@@ -509,6 +509,9 @@ MwClassRec MwVulkanClassRec = {
     destroy, /* destroy */
     NULL,    /* draw */
     NULL,    /* click */
-    NULL     /* parent_resize */
+    NULL,    /* parent_resize */
+    NULL,    /* mouse_move */
+    NULL,    /* mouse_up */
+    NULL     /* mouse_down */
 };
 MwClass MwVulkanClass = &MwVulkanClassRec;