[macOS] Replace MoltenVK framework with dylibs

[ptxmac]

No description provided.

[garymm]

@ptxmac LMK if there's a better forum to discuss this, but I'm seeing some strange behavior.
The libMoltenVK.dylib seems to behave differently if it's packaged with my app on its RPATH vs in /usr/local/lib.

When I package it with my application, at runtime it says that it is missing VK_KHR_get_physical_device_properties2. When I have it installed in /usr/local/lib it works as expected.

I've also tried linking statically against libMoltenVK.a, same results.

LMK if you have any idea what's going on. Thanks!

[garymm]

Ah I figured this out. I was linking the library properly, but at runtime the Vulkan code looks for /share/vulkan/icd.d/MoltenVK_icd.json. I'm now trying to figure out how to package that with a go binary.