MFH: r477696

graphics/graphite2: update to 1.3.12

Changes: https://sourceforge.net/p/silgraphite/mailman/message/36392530/
Changes: https://github.com/silnrsi/graphite/compare/1.3.11...1.3.12
ABI: https://abi-laboratory.pro/tracker/timeline/graphite/
Security: CVE-2018-7999
Approved by: ports-secteam blanket (required by Firefox 63)