Optimise uuid platform detection

[zooba]

BPO	41364
Nosy	@zooba, @miss-islington
PRs	bpo-41364: Reduce import overhead of uuid module #21586 [3.9] bpo-41364: Reduce import overhead of uuid module (GH-21586) #21589 [3.8] bpo-41364: Reduce import overhead of uuid module (GH-21586) #21591

^{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 = 'https://github.com/zooba'
closed_at = <Date 2020-07-22.11:27:00.848>
created_at = <Date 2020-07-21.20:41:32.129>
labels = ['3.8', 'library', '3.9', '3.10', 'performance']
title = 'Optimise uuid platform detection'
updated_at = <Date 2020-07-22.11:27:00.847>
user = 'https://github.com/zooba'

bugs.python.org fields:

activity = <Date 2020-07-22.11:27:00.847>
actor = 'steve.dower'
assignee = 'steve.dower'
closed = True
closed_date = <Date 2020-07-22.11:27:00.848>
closer = 'steve.dower'
components = ['Library (Lib)']
creation = <Date 2020-07-21.20:41:32.129>
creator = 'steve.dower'
dependencies = []
files = []
hgrepos = []
issue_num = 41364
keywords = ['patch']
message_count = 4.0
messages = ['374079', '374080', '374081', '374091']
nosy_count = 2.0
nosy_names = ['steve.dower', 'miss-islington']
pr_nums = ['21586', '21589', '21591']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'performance'
url = 'https://bugs.python.org/issue41364'
versions = ['Python 3.8', 'Python 3.9', 'Python 3.10']

[zooba]

The uuid module calls platform.system() multiple times, even when the result is known from sys.platform. We can avoid some of these.

[zooba]

New changeset bf2f76e by Steve Dower in branch 'master':
bpo-41364: Reduce import overhead of uuid module (GH-21586)
bf2f76e

[miss-islington]

New changeset 00466db by Miss Islington (bot) in branch '3.9':
bpo-41364: Reduce import overhead of uuid module (GH-21586)
00466db