news/tin: Improve port

• Switch from PORTVERSION to DISTVERSION
• Clean up MASTER_SITES and use upstream main site as backup
• Switch to xz release tarball
• Use helpers whenever possible and USES= localbase:ldflags
• Sort CONFIGURE_ARGS as they're listed when executing ./configure --help
• Sort OPTIONS
• Rearrange Makefile to closer match Porters Handbook

PR: 280279
Reviewed by: kbowling