[Vm-dev] [OpenSmalltalk/opensmalltalk-vm] Initial port of the B3DAccelerator plugin, plus extra Metal and rendering clean up (#382)

[maenu]

Sorry to revive the merged thread, but what is the state on this?

I just built the macOS 64bit Pharo Cog VM on HighSierra, Metal seems to be enabled (`-DUSE_METAL=1`), and the VM runs my image. But downloading a fresh VM from Pharo downloads gives me `2019-03-27 11:48:46.282 Pharo[1041:7933912] Pipeline state creation error: Function screenQuadFragmentShader is using language version 2.1 which is incompatible with this OS.` again. 

My current hypothesis is, that the downloaded VM is built on a newer macOS, which removes the compatibility for High Sierra. Anybody knows how this happens and how we could trick a newer macOS in building a VM with a High Sierra compatibility?

The only thing I found to control compatibility is the `-mmacosx-version-min`, which is `10.7` in my local build. It looks like there is nothing other than this flag to achieve compatibility, see also https://github.com/gfx-rs/gfx/blob/master/src/backend/metal/build.rs.

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