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gh-98410: move getbufferproc and releasebufferproc to buffer.h (#31158)

This adds them to the Limited API.
D
David Hewitt committed
e98923c0be644c474ce0e318d40e0595e4484106
Parent: a41de32
Committed by GitHub <noreply@github.com> on 10/31/2022, 2:01:32 PM