build: Remove a lot of old SPI build cruft

AcademySoftwareFoundation / OpenShadingLanguage

Advanced shading language for production GI renderers

BSD 3-Clause "New" or "Revised" License

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Closed lgritz closed 4 months ago

lgritz commented 4 months ago

Sweep away some SPI-specific build customization that hasn't been relevant for a long time.