Core: Fix includes (extern)
Core: Fix includes (extern)

sklnet/DirectFB,lancebaiyouview/DirectFB,lancebaiyouview/DirectFB,jcdubois/DirectFB,lancebaiyouview/DirectFB,djbclark/directfb-core-DirectFB,deniskropp/DirectFB,lancebaiyouview/DirectFB,sklnet/DirectFB,sklnet/DirectFB,kaostao/directfb,jcdubois/DirectFB,deniskropp/DirectFB,sklnet/DirectFB,djbclark/directfb-core-DirectFB,djbclark/directfb-core-DirectFB,jcdubois/DirectFB,djbclark/directfb-core-DirectFB,kaostao/directfb,deniskropp/DirectFB,kaostao/directfb,deniskropp/DirectFB