Only the lua binary depends on libreadline and ncurses, not the library,
so lua53-devel doesn't need to depend on their devel packages.
The package has listed these dependencies explicitly for a long time (at
least before 2013), so it being there until today seems to be more of a
historical artifact then for an actual reason.
While we are here, remove ncurses-devel from makedepends, since it's no
longer used by the lua build system (this doesn't make a huge
difference, because readline-devel still pulls it in).
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