[interfaces] Turn error from missing interface directories into a debug message.
[interfaces] Turn error from missing interface directories into a debug message.

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