Investigate why raw glsl/hlsl shaders are only possible in subset of devices

[axsaucedo]

There has been several issues reported such as #84 and #70 where Vulkan fails on vk::Pipeline creation when shader data is passed as raw glsl/hlsl string. This seems to be specific to a device so it is suspected to be due to potentially dependencies like shaderc not being present, but would be worth confirming as this would help ensure the build can explicitly check that certain macro guards are present on compile time.

[axsaucedo]

It seems that this is due to the shaderc libraries not being present but needs further testing to confirm fully.

[axsaucedo]

Fixed via #150