Log Message:
npth: update to 1.7.

Noteworthy changes in version 1.7 (2024-02-23)  [C2/A2/R0]
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 * The npth-config command is not installed by default, because it is
   now replaced by use of pkg-config/gpgrt-config with npth.pc.
   Supply --enable-install-npth-config configure option, if needed.

 * Support for legacy systems w/o pthread_rwlock_t support.  [T4306]

 * New functions npth_poll and npth_ppoll for Unix.  [T5748]

 * Fixes to improve support for 64 bit Windows.

 * Fix declaration conflict using newer mingw versions.  [T5889]

 * Fix build problems on Solaris 11.  [T4491]

 * Fix detecting of the pthread library.  [rPTH6629a4b801]

 * Clean up handling of unsafe semaphores on AIX.  [T6947]

 * Link without -flat_namespace to support macOS 11.  [T5610]