Remove expired ports:

2020-08-26 audio/timidity++-tcltk: Broken for more than 6 months
2020-08-26 biology/pbcopper: Broken for more than 6 months
2020-08-26 devel/ace: Broken for more than 6 months
2020-08-26 devel/bin86: Broken for more than 6 months
2020-08-26 devel/erlang-oserl: Broken for more than 6 months
2020-08-20 emulators/qemu40: Please consider using qemu or qemu41
2020-08-26 games/linux-darwinia-demo: Broken for more than 6 months
2020-08-26 games/linux-defcon: Broken for more than 6 months
2020-08-26 games/linux-uplink-demo: Broken for more than 6 months
2020-08-26 games/xevil: Broken for more than 6 months
2020-08-26 games/xminesweep: Broken for more than 6 months
2020-08-26 graphics/backfract: Broken for more than 6 months
2020-08-26 japanese/kanjipad: Broken for more than 6 months
2020-08-26 japanese/xdtp: Broken for more than 6 months
2020-08-26 korean/hpscat: Broken for more than 6 months
2020-08-26 math/barvinok: Broken for more than 6 months
2020-08-26 math/openmesh: Broken for more than 6 months
2020-08-26 math/rehearse: Broken for more than 6 months
2020-08-26 net/hinfo: Broken for more than 6 months
2020-08-26 science/fleur: Broken for more than 6 months
2020-08-26 science/lm: Broken for more than 6 months
2020-08-26 security/ddos_scan: Broken for more than 6 months
2020-08-26 security/gag: Broken for more than 6 months
2020-08-26 security/py-keystone: Broken for more than 6 months
2020-08-26 sysutils/mono-kmod: mastersite disappeared, unfetchable
2020-08-26 x11-themes/gtk-cleanice-engine: Broken for more than 6 months
2020-08-26 x11-wm/aewm: Broken for more than 6 months