Simplified forward declaration macro for interfaces.
Simplified forward declaration macro for interfaces.

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