Vulkan demo broken.

[takev]

Looks like it can't find the shader in it's resource directory.

[kamrann]

Just to add a bit of extra info having run into this.

• It may relate to multi-config generators; I end up with out/examples/vulkan/triangle/ containing a resources/ folder, but also instead of the executable alongside, it's in Debug/ etc. subfolders.
• Looks like there is some logic to detect development builds and fallback onto resources in the source tree, but this appears not to work in this case, I'm guessing because there's some shader-compilation happening so the source resources folder is incomplete.