Dispatch surface's notifications asynchronously.
Dispatch surface's notifications asynchronously.

This change fixes an assertion failure that happens in the following case:
1. Resize (Downsize) Surface
... and immediatly after ...
2. Blit to Surface

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