When emitting from IR, skip structured types with `__builtin` modifier (#442)

This allows users who call `spAddBuiltins` to specify `struct` types that are provided for a target, and that should not be part of the generated HLSL/GLSL from Slang.

The existing emit logic already skips emitting any basic, vector, matrix, or resource types, so this case really only triggers when the standard library needs to declare a completely ordinary `struct`.

No provision is made right now for a `struct` type that might be builtin on one target, but need to be declared on another. That is a clear next step for this feature.

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