Build using unix timestamps

[pie6k]

https://github.com/kwhat/libuiohook/pull/113/files

Libuiohook has added an option to use unix timestamp instead of mach_absolute_time (https://developer.apple.com/documentation/kernel/1462446-mach_absolute_time) for event.time

I think it would be useful to switch to use it.

[jagadeesh-turing]

@SnosMe I tried to build with the branch wip1.3 because I want to use the unix timestamp but ran into some build errors.
Is it just me, or are there some pending changes?

TIA

[SnosMe]

GH actions completed for it, so it's on your side.
I don't release it because found some bugs made after refactoring in upstream lib.