X11: Add dfb_surface_notify_display() calls to primaryFlipRegion()
X11: Add dfb_surface_notify_display() calls to primaryFlipRegion()

This function should actually be called, when the buffer is displayed,
e.g. for queued swap happening on vsync.

DirectFB/directfb,kevleyski/DirectFB-1,djbclark/directfb-core-DirectFB,sklnet/DirectFB,Distrotech/DirectFB,dfbdok/DirectFB1,sklnet/DirectFB,djbclark/directfb-core-DirectFB,deniskropp/DirectFB,kevleyski/directfb,Distrotech/DirectFB,kaostao/directfb,kaostao/directfb,jcdubois/DirectFB,kevleyski/directfb,jcdubois/DirectFB,lancebaiyouview/DirectFB,DirectFB/directfb,sklnet/DirectFB,Distrotech/DirectFB,DirectFB/directfb,lancebaiyouview/DirectFB,deniskropp/DirectFB,djbclark/directfb-core-DirectFB,djbclark/directfb-core-DirectFB,dfbdok/DirectFB1,kevleyski/DirectFB-1,mtsekm/test,deniskropp/DirectFB,deniskropp/DirectFB,kevleyski/DirectFB-1,sklnet/DirectFB,mtsekm/test,kaostao/directfb,kevleyski/directfb,lancebaiyouview/DirectFB,lancebaiyouview/DirectFB,mtsekm/test,jcdubois/DirectFB,dfbdok/DirectFB1,kevleyski/directfb,kevleyski/DirectFB-1