cleanup: change OSL_CONSTEXPR14 to constexpr

AcademySoftwareFoundation / OpenShadingLanguage

Advanced shading language for production GI renderers

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

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Closed lgritz closed 2 months ago

lgritz commented 2 months ago

We've been C++14 minimum for a long time now, we can just say constexpr.

Change a couple of stray OIIO_CONSTEXPR14 occurrences as well.