bpo-45893: Add missing extern C to initconfig.h (GH-29761)


Co-authored-by: Steve Dower <steve.dower@python.org>
(cherry picked from commit f4afc53bf68c8ded20b281cd1baa88a679b4a3fd)

Co-authored-by: Christian Heimes <christian@python.org>
2 files changed