* Synced with GENie upstream revision e78d6c1
* Add Visual Studio 2019 support
* Fix hardcoded -m64
* Switch appveyor to Visual Studio 2019
* Fix genie being built as 32-bit
* MSVC build is known to be broken currently. Let it fail until all the known issues are fixed.
* Update the packages before building
* Build with 3 threads
Appveyor VMs have only 2 cores and 8 GB RAM.
* Enable caching of pacman cache
This effectively reverts b380514764 and
c24473ddff, restoring the state at
598cd52272.
Before pushing, please check that what you're about to push is sane.
Check your local commit log and ensure there isn't anything out-of-place
before pushing to mainline. When things like this happen, it wastes
everyone's time. I really don't need this in a week when real work™ is
busting my balls and I'm behind where I want to be with preparing for
MAME release.
