The older recipe doesn't build anymore.
This recipe builds 4 packages:
noto_sans_cjk_tc-1.004-1-any.hpkg
noto_sans_cjk_sc-1.004-1-any.hpkg
noto_sans_cjk_kr-1.004-1-any.hpkg
noto_sans_cjk-1.004-1-any.hpkg
All packages contain the glyphs for all 4 languages, only differ in
which is the "default" (also determines the title shown in font list,
e.g. "Nano Sans CJK JP"), if I understand it correctly.
The last plain "noto_sans_cjk" hpkg contains the Japanese default.
I couldn't get the recipe to build a package "noto_sans_cjk_jp" without
ending up with an empty "noto_sans_cjk" which has to be build to reflect
the recipe name.
It's not a big problem IMO, since a custom title "Noto Sans CJK Japanese"
can be set at the HaikuDepot webserver.
Feel free to improve the recipe or suggest changes I should work on.