Remove superfluous "extern C" bits from Include/cpython/*.h

[smontanaro]

BPO	39583
Nosy	@smontanaro, @ncoghlan, @vstinner
PRs	bpo-39583: Remove superfluous "extern C" bits from Include/cpython/*.h #18413

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = <Date 2020-06-02.01:21:03.392>
created_at = <Date 2020-02-08.13:50:05.597>
labels = ['expert-C-API', 'type-feature', '3.10']
title = 'Remove superfluous "extern C" bits from Include/cpython/*.h'
updated_at = <Date 2020-06-02.01:21:03.387>
user = 'https://github.com/smontanaro'

bugs.python.org fields:

activity = <Date 2020-06-02.01:21:03.387>
actor = 'vstinner'
assignee = 'none'
closed = True
closed_date = <Date 2020-06-02.01:21:03.392>
closer = 'vstinner'
components = ['C API']
creation = <Date 2020-02-08.13:50:05.597>
creator = 'skip.montanaro'
dependencies = []
files = []
hgrepos = []
issue_num = 39583
keywords = ['patch']
message_count = 2.0
messages = ['361628', '370571']
nosy_count = 3.0
nosy_names = ['skip.montanaro', 'ncoghlan', 'vstinner']
pr_nums = ['18413']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue39583'
versions = ['Python 3.10']

[smontanaro]

I noticed that the files in Include/cpython also have extern C declarations, despite the fact that the only files which #include them do as well. Seems like a small bit of cleanup. PR incoming...

[vstinner]

New changeset b4d5a5c by Skip Montanaro in branch 'master':
bpo-39583: Remove superfluous "extern C" bits from Include/cpython/*.h (GH-18413)
b4d5a5c