configure: Add check for OpenCL support
configure: Add check for OpenCL support

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