lwIP | Upstream unistd needs sethostid definition (#13)

Fri Apr 24 02:46:03 UTC 2026

Kinsey Moore created an issue: https://gitlab.rtems.org/rtems/pkg/rtems-lwip/-/issues/13

## Summary
unistd.h in newlib does not contain a prototype for sethostid. The update to GCC 15.x made use of the sethostid implementation in rtems-lwip an error instead of a warning.

## Steps to reproduce

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View it on GitLab: https://gitlab.rtems.org/rtems/pkg/rtems-lwip/-/issues/13
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