MFH: r441132

Update freetype2 to 2.8.

• `Light' auto-hinting mode no longer uses TrueType metrics for TrueType fonts. It causing horizontal scaling also. Add option if people want it back.
• Update pkg-descr, 2.7 started this but I committed the WIP version.

Exp-run done by: antoine@

PR: 219271
Exp-run by: antoine@
Security: 4a088d67-3af2-11e7-9d75-c86000169601
Security: CVE-2017-8105, CVE-2017-8287

Approved by: ports-secteam@ (miwi@)