Testing: test both openexr old and core versions #3604
Merged
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On any one platform, our testsuite was only testing the old C++ or the new C core exr implementations.
Rig it to run the openexr-oriented tests twice -- once in each state (when using OpenEXR new enough to support the core library).
Doing this cleanly required adding SUFFIX and ENVIRONMENT optional parameters to the oiio_add_tests utility macro. Once that was added, the texture batch testing could be implemented that way as well, removing a bunch of hackier special purpose code.