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Fix #514: Set pipelineLaunchParamsVariableName to nullptr for empty raygen shaders (#540)

OptiX expected SLANG_globalParams even when the Slang compiler correctly
omitted it (no uniform parameters). Now we check PTX for the variable and
set pipelineLaunchParamsVariableName to nullptr when absent.

This fix addresses Simon's feedback to move the implementation to
optix-api-impl.cpp following the multi-version OptiX refactoring.

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