Fix warning in non-debug build by putting an '#if D_DEBUG_ENABLED' around the static const table of strings used only in the debug message further below.
Fix warning in non-debug build by putting an '#if D_DEBUG_ENABLED' around
the static const table of strings used only in the debug message further below.

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