Suppress -Wunused-function about _import_array when compiling tkagg.cpp. #19094
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Per
https://numpy.org/doc/1.17/reference/c-api.array.html#c.NO_IMPORT_ARRAY
Other extension modules in Matplotlib already use the same mechanism.
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).