games/stockfish: Update to 9
Additional port changes:
- Changed to DISTVERSION
- Added DISTVERSIONSUFFIX
- Removed DISTNAME/DISTFILES
- Added LICENSE_FILE
- Removed WRKSRC
- Added NO_WRKSUBDIR
- Added WRKSRC_SUBDIR
- Removed the blank PORTDATA
- Updated the path in do-install-DOCS-on
PR: 226129
Submitted by: m.ne@gmx.net
Approved by: Gautam Mani <execve@gmail.com>, tcberner (mentor, implicit)