graphics/openexr: graphics/ilmbase: v2.5.4 update
"Patch release with various bug/sanitizer/security fixes, primarily related to
reading corrupted input files."
https://github.com/AcademySoftwareFoundation/openexr/releases/tag/v2.5.4
Cherry-pick upstream commit for GCC 11 compatibility:
https://github.com/AcademySoftwareFoundation/openexr/commit/a40a6151c4e746eb8f93c7c06992d0ec11289fdc
Since this changes the patchlevel of the solibs, bump PORTREVISION of dependent
ports just to be sure.
(graphics/py-openshadinglanguage is unaltered and .includes the revision bump
from .../openshadinglanguage.)
MFH: 2021Q1 (this requires discussion by ports-secteam@!)