ImageReaderTest : Alter error regex.
ImageReaderTest : Alter error regex.

This works around a confusing problem whereby OIIO (or perhaps OpenEXR) throw different errors when compiled with gcc 6 c++14 vs gcc 4 c++11. Both throw, and the first part of the sentance is the same, but the last few words vary between "Scan line 29 is missing." and "Unexpected end of file."

appleseedhq/cortex,appleseedhq/cortex,appleseedhq/cortex