Solved: Black screen in macOS build, January 2019

[Simon]

Closing this because Benedict (new player, I exchanged some email with him) got it running perfectly on the Mac.

I'm happy that Lix compiles and runs well on the Mac now, even though we've never found the true reason for this #381. SiegeLord was happy to chalk an Allegro problem up to a known 2018 bug on OSX. Given that, I'm content closing this, hoping that the same Mac bugfix also fixed this #381.

If anybody runs into troubles on Mac again, feel free to file new bugs!

-- Simon