The Minetest engine and the "Minetest Game" have been decoupled upstream
in Minetest 5.9.0:
https://dev.minetest.net/Changelog#Minetest_Game
* gnu/packages/minetest.scm (minetest): Update to 5.9.0.
[arguments]: Adjust #:configure-flags and #:phases to account for the
removal of the Minetest Game from the Minetest codebase.
[native-search-paths, synopsis, description]: Likewise.
[inputs]: Remove IRRLICHT-FOR-MINETEST.
(minetest-data): Update to 0.0.0-0.88ecab3. Rename to MINETEST-GAME and
deprecate MINETEST-DATA.
[synopsis, description]: Adjust to account for the decoupling of the game from
the engine.
* gnu/packages/games.scm (irrlicht-for-minetest): Remove variable.
* guix/build-system/minetest.scm (default-minetest-game): New variable.
(%default-modules): Use it.
Change-Id: I0117bd33a2ce5eb1c79fdb29878682081f61dd4e
Signed-off-by: Leo Famulari <leo@famulari.name>