Fix Bop_a8_set_alphapixel_Aop_yuy2() for big endian.
Fix Bop_a8_set_alphapixel_Aop_yuy2() for big endian.

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