libhext: cmake: remove ability to disable build of libhext-test
libhext: cmake: remove ability to disable build of libhext-test

thomastrapp/hext,thomastrapp/hext,thomastrapp/hext,thomastrapp/hext,thomastrapp/hext,thomastrapp/hext,thomastrapp/hext,thomastrapp/hext