[X2Go-Project] Shutdown and update of macOS builders

Hi

So far, our macOS builders were based on OS X 10.10 and macOS 10.12 and have built X2Go Client package bundles targeted to these platforms.

Coming up in the next few hours, I will shutdown, backup and update the builders.

The OS X 10.10 machine will be updated to OS X 10.11 and the macOS 10.12 machine will be updated to macOS 10.13.

My personal machine will stay on OS X 10.9 and be used to build package bundles targeted to this platform.

Regards,

Mihai Moldovan