build(cmake): Fix incorrect variable name to control symbol visibility #1681
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As Fabrice Macagno pointed out on the oiio-dev mail list, we weren't setting the correct variable name CMAKE_CXX_VISIBILITY_PRESET.
And, oops, this also revealed that there were some things that needed to be declared public that were not (because, specifically, they needed to be called across library boundaries by the per-ISA dynamic libraries used by batch shading!).