[CMake] Find Vulkan on 32 bit builds

[Rolf Eike Beer]

> There's a couple of ways to fix this; for instance, on Windows I could
> use NO_DEFAULT_PATH on the find_library call and that would resolve the
> issue. The main reason why I haven't done this yet is because I think
> that's a packaging bug in the Vulkan SDK side which I was going to
> report there (I want to ask them to move the libraries into a lib/
> subfolder, and ideally use different names for different 
> architectures.)

Ideally they would just provide CMake config files then…

Eike
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