[issue23903] Generate PC/python3.def by scraping headers

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

They do. Functions PyCFunction_New, _PyTrash_deposit_object etc are compiled and exported even if they don't represented in headers.

Actually we can remove the PyCFunction_New function since it was converted to to a macro before Python 3.0 (faabd9867fb8). No one Python 3 extension uses it. But this is separate issue. _PyTrash_deposit_object was used in 3.2.3 and should be kept for binary compatibility.

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