build(deps): Fixes to using OIIO::ArgParse for OIIO 3.0

AcademySoftwareFoundation / OpenShadingLanguage

Advanced shading language for production GI renderers

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

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Closed lgritz closed 1 month ago

lgritz commented 1 month ago

OIIO 3.0 will finally warn aggressively about some long-deprecated ArgParse methods. Switch to the newer idioms on the OSL side.