libdirect: Add fallback definition for SIGUNUSED.
libdirect: Add fallback definition for SIGUNUSED.

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