Fix OpenEXR3 compatibility (raises minimum version) and use upstream's CMake Config #41
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We have been carrying this patch downstream since 2022 without bugs reported: https://bugs.gentoo.org/833492
OpenEXR 3 release and compatible upstream CMake Config goes back to the beginning of 2021. Last commit to OpenEXR 2.5 branch was made more than 2 years ago and it is safe to say that was the last one.
Other distributions applying similar patches:
https://gitlab.archlinux.org/archlinux/packaging/packages/openscenegraph/-/blob/main/openscenegraph-openexr3.patch
https://src.fedoraproject.org/rpms/OpenSceneGraph/blob/rawhide/f/OpenSceneGraph-openexr3.patch