* gnu/packages/engineering.scm (ao): Rename...
(libfive): ...to this new variable; update to 0-2.9d857d1.
[inputs]: Remove glfw, libepoxy, glm, guile-2.0; add qtbase, guile-2.2.
[home-page]: Use new libfive home page.
[description]: Adjust.
(ao): Redefine using 'deprecated-package'.