Replace GLM_INLINE with GLM_FUNC_QUALIFIER in vec_swizzle.hpp

[tomix1024]

When using a CUDA compiler, I cannot call the swizzling functions like glm::xxyy() from device code.
They are currently only declared as GLM_INLINE. Using GLM_FUNC_QUALIFIER additionally specifies the __host__ and __device__ attributes when appropriate.

[christophe-lunarg]

This issue is resolved by #1173
It's a different PR, only to run the tests using Github actions. Thanks for contributing!