MFH: r419075

graphics/gegl3: apply r386216 + previous commit

• Bundled poly2tri-c is under BSD3CLAUSE
• Only V4L still uses LGPL20+ code
• More (but not all) operations/common/*.c are under GPLv3

While here define CPE information.

Approved by: portmgr blanket
Approved by: ports-secteam blanket