Deprecate some old globals in qt_compat. #20881
Merged
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Especially, note that QT_RC_MAJOR_VERSION originally pointed to the qt
major version selected by the rcParams (qt4agg/qt5agg), which doesn't
even have an equivalent now that we moved to a single qtagg backend.
PR Summary
PR Checklist
pytest
passes).flake8
on changed files to check).flake8-docstrings
and runflake8 --docstring-convention=all
).doc/users/next_whats_new/
(follow instructions in README.rst there).doc/api/next_api_changes/
(follow instructions in README.rst there).