Fix osoparse & osolex from two independent liboslexec.so #1255
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Description
When two OSL distributions are loaded, they will both use the same
osoparseandosolexfunctions.Problematic because the OSOReader::parse_XXX function from liboslexec_A.so will set the static variable
osoreader = this, but then callosoparsein liboslexec_B.so, where theosoreaderstatic is still NULL.https://github.com/marsupial/OpenShadingLanguage/blob/62797a9032a73162a62e19d03261d7d8bd3a8ded/src/liboslexec/osolex.l#L263
https://github.com/marsupial/OpenShadingLanguage/blob/62797a9032a73162a62e19d03261d7d8bd3a8ded/src/liboslexec/osolex.l#L287