configure: fix use of undeclared variable have_fusionsound
configure: fix use of undeclared variable have_fusionsound

In addition, HAVE_FUSIONSOUND is set in a different place already,
based on $enable_fusionsound

Signed-off-by: André Draszik <4a4cb09e7b43b167f95b1dc166b9a7dec9f65d7c@st.com>

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