audio/jack-example-tools: Update to 4 release.
ChangeLog: https://github.com/jackaudio/jack-example-tools/releases/tag/4
- Fix a typo in alsa_in manpage
- Fix source-code comments and manpage for jack_simple_client
- Remove includes of non-standard alloca.h header
PR: 269414
Reported by: dev@submerge.ch (maintainer)