Re-enable buffer API slots for heap types

[BennoRice]

BPO	20233
Nosy	@loewis, @mdickinson, @ncoghlan, @pitrou, @kristjanvalur, @vstinner, @pv, @skrah, @akheron

^{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 = None
created_at = <Date 2014-01-13.03:46:55.573>
labels = ['extension-modules', 'type-feature']
title = 'Re-enable buffer API slots for heap types'
updated_at = <Date 2019-03-15.22:27:56.166>
user = 'https://bugs.python.org/BennoRice'

bugs.python.org fields:

activity = <Date 2019-03-15.22:27:56.166>
actor = 'BreamoreBoy'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Extension Modules']
creation = <Date 2014-01-13.03:46:55.573>
creator = 'Benno.Rice'
dependencies = []
files = []
hgrepos = []
issue_num = 20233
keywords = []
message_count = 2.0
messages = ['208002', '237602']
nosy_count = 15.0
nosy_names = ['loewis', 'teoliphant', 'mark.dickinson', 'ncoghlan', 'rupole', 'pitrou', 'kristjan.jonsson', 'vstinner', 'joshtriplett', 'pv', 'skrah', 'Benno.Rice', 'python-dev', 'jcon', 'petri.lehtinen']
pr_nums = []
priority = 'normal'
resolution = None
stage = None
status = 'open'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue20233'
versions = ['Python 3.4', 'Python 3.5']

[BennoRice]

The API slots for bf_getbuffer and bf_releasebuffer are still disabled despite the bug referenced (bpo-10181) being marked as fixed. These should be re-enabled if the stable ABI is to be used for types that use buffers.

[BreamoreBoy]

I've updated the nosy list with the names from bpo-10181 as that's referenced in msg208002.