New port: korean/sourcehanserif-otf: Korean font by Adobe designed for user interfaces

[kai]

Summary

"Source Han Serif supports four different East Asian languages---Simplified
Chinese, Traditional Chinese, Japanese, and Korean---and the 65,535 glyphs in
each of its seven weights are designed to work together with a consistent design
that emphasizes shared elements between the languages while honoring the
diversity of each. Also included is a rich set of Western glyphs supporting the
Latin, Greek, and Cyrillic scripts, which were derived from Source Serif."

• The Typekit, Adobe

WWW: https://github.com/adobe-fonts/source-han-serif

PR: 232188
Submitted by: Hyun Hwang
Approved by: (one of the mentors)

Test Plan

• poudriere (11.2-, 12.0-RELEASE, 13.0-CURRENT@r344112 amd64 + i386) with options FULL/SUBSET each -> OK
• portlint -> OK
• Runtime tests by using desktuils/gucharmap -> OK

Minor changes from the original patch:

• Simplify the usage of the options and thus omit the bsd.port.options.mk include
• Removed variables FONTTYPE and FONTFORMAT (I haven't found any occurences of those variables in the ports framework)
• Implicit introducion of variable SRCFONTSDIR that is used by the options

[miwi]

LGTM