fusion: Provide fusion_skirmish_init2 on single app builds
fusion: Provide fusion_skirmish_init2 on single app builds

Change 08ba2335fd9e6ce9895af02a906f57f7ffbc0d65 introduced calling
fusion_skirmish_init2 in src/core/gfxcard.c. Introduce a version for
single app that just calls fusion_skirmish_init as everything should
be local on a single app system.

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