emulators/hatari: Update 2.5.0 => 2.6.0
Upstream migrated to GitLab.
Changelog:
https://framagit.org/hatari/hatari/-/releases/v2.6.0
Improve manual pages patching and installation.
Fix warnings from portclippy.
Remove unused dependency iconv.
PR: 288772
Co-authored-by: Vladimir Druzenko <vvd@FreeBSD.org>