devel/libchdr: update to 0.3.0
- This is the first formally tagged release version. The port can switch to using release tags instead of commit hashes.
- Replace hardcoded SOVERSION in pkg-plist with the DISTVERSION-derived value.
Changelog: https://github.com/rtissera/libchdr/releases/tag/v0.3.0
PR: 294810
Event: Wiesbaden Hackathon 202604