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stddef.h/stdlib.h: Remove unused rune_t
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Authored by brooks on May 31 2024, 7:12 PM.
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Details

Summary

This non-standard type is unused in the base system (ct_rune_t or
rune_t are used instead) and ports. It has been around as long as our
current source repo, but we have avoided using it. In sys/_types.h
where the __*rune_t typedefs are defined, the following appears in a
comment:

NOTE: rune_t is not covered by ANSI nor other standards, and should
not be instantiated outside of lib/libc/locale.  Use wchar_t.

The definition of this unused type meant we gratutiously differed from
standards compliant stddef.h/stdlib.h.

PR: 279357 (exp-run by antoine)

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