Log Message:
npth: updated to 1.8

Noteworthy changes in version 1.8 (2024-11-12)

* Fix npth_cond_signal and npth_cond_broadcast on Windows.
* New function npth_get_version.  New macros NPTH_VERSION and
  NPTH_VERSION_NUMBER.
* Fix INSERT_EXPOSE_RWLOCK_API for musl C library.
* Add fallback implementation for POSIX semaphore API on macOS.
* Return a run-time error if npth_rwlock_timedrdlock is not
  supported.