Create a directory for the shaders before compilation

[GoncaloFDS]

The first time you compile the project on windows the build fails because the shader compilation output directory does not exist.

This line creates that directory.

[GPSnoopy]

I'm curious why this works on my machine and the CI but not on yours? Something must be different.

Mind you, we already do explicitly create the directory on Linux, so this would just bring Windows on par. I need to clean this up at some point, the repo is a bit of a mess for the moment.

[GoncaloFDS]

I'm using clion, so that might have something to do with it. I'll try building with VS to see if the problem is related to the ide.