use NO_COMPRESSION in OpenEXRTest/testBackwardCompatibility #916
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Following discussion in #876, use NO_COMPRESSION in Backwards Compatibility test. zlib is not guaranteed to produce binary-identical compressed data, so different builds of the OpenEXR library will not produce binary-identical compressed files when the default ZIP_COMPRESSION is used. NO_COMPRESSION should produce binary identical files.
The test files were recreated using the OpenEXR-1.7.1 library.
Signed-off-by: Peter Hillman peterh@wetafx.co.nz