Replace PLATLIBDIR macro with config->platlibdir

BPO	40947
Nosy	@vstinner, @manisandro
PRs	bpo-40947: Replace PLATLIBDIR macro with config->platlibdir #20799 bpo-40947: getpath.c uses PyConfig.platlibdir #20807 [3.9] bpo-40947: getpath.c uses PyConfig.platlibdir (GH-20807) #20813

^{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 2020-06-11.16:27:28.317>
created_at = <Date 2020-06-11.10:06:46.306>
labels = ['interpreter-core', '3.9', '3.10']
title = 'Replace PLATLIBDIR macro with config->platlibdir'
updated_at = <Date 2020-07-28.11:46:03.068>
user = 'https://github.com/manisandro'

bugs.python.org fields:

activity = <Date 2020-07-28.11:46:03.068>
actor = 'steve.dower'
assignee = 'none'
closed = True
closed_date = <Date 2020-06-11.16:27:28.317>
closer = 'vstinner'
components = ['Interpreter Core']
creation = <Date 2020-06-11.10:06:46.306>
creator = 'smani'
dependencies = []
files = []
hgrepos = []
issue_num = 40947
keywords = ['patch']
message_count = 4.0
messages = ['371260', '371294', '371305', '371306']
nosy_count = 2.0
nosy_names = ['vstinner', 'smani']
pr_nums = ['20799', '20807', '20813']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue40947'
versions = ['Python 3.9', 'Python 3.10']