devel/libepoll-shim: update to 0.0.20210213

[jbeich]

Summary

See change log

Test Plan

• Builds fine on 11.4/12.2/13.0 amd64/i386, 12.2 aarch64, 13.0 aarc64/armv6/armv7
• Runtime tested on Sway with alacritty, emacs (pgtk), firefox, mesa-devel, mpv, yuzu-qt5 (vulkan)
• Confirmed foot < 1.6.4 no longer hangs on exit because ssi_pid is populated

[jbeich]

• Drop unrelated yuzu WIP change

[manu]

LGTM