[configure] Fixed typo in X11 detection.
[configure] Fixed typo in X11 detection.

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