aw-qt long start/exit

[lundibundi]

When you start aw-qt it takes like 20 seconds to start up before it's usable.
Also after I press Quit ActivityWatch button in the right-click menu it takes like 20 seconds for the confirmation dialog to show up.

I think both of those are related to outdated fontconfig as I've seen similar reports for other programs (telegram, peek, chromium)

This #33 should probably solve it, but I think it's better for it to be saved here to make sure it's fixed later.

Arch linux, AW installed via AUR package, latest version.
Linux neko 4.17.2-1-ARCH #1 SMP PREEMPT Sat Jun 16 11:08:59 UTC 2018 x86_64 GNU/Linux