Noteworthy changes in version 1.7 (2024-02-23)

• 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]

(next: T7387)