libhext/test: cmake: fix FIND_PACKAGE not aborting build when missing Gumbo or Threads
libhext/test: cmake: fix FIND_PACKAGE not aborting build when missing Gumbo or Threads

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