emulators/advancemenu: prepare for freetype2 update

• freetype2 will no longer ship freetype-config (which was a pkg-config

wrapper) in the near future -- use pkg-config to gather the required
flags by mocking freetype-config.

• while here, mark as abandonware
  • port has version 2.8 is from 07-08-2015
  • upstream version 3.0 is from 04-12-2016