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openexr: Fix build on Ubuntu 18.04

!807 (merged) was intended to fix a build failure caused by the introduction of a C++11 header in the openexr library (more info here). Unfortunately, the logic implemented does not work on Ubuntu 18.04 since the offending commit was backported into version 2.2.0 as part of a broader set of security patches.

if openexr_dep.version().version_compare('< 2.4.0')
  openexr_cppargs += cxx.get_supported_arguments(['-std=c++98'])
endif

Tl;dr: On Ubuntu 18.04, version 2.2.0 of openexr now needs to be compiled with -std=c++11. Therefore, the above logic needs to be updated.

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