Update to libmpdec-2.5.1

[skrah]

BPO	41369
Nosy	@rhettinger, @facundobatista, @mdickinson, @pitrou, @skrah, @serhiy-storchaka
PRs	bpo-41369 Update to libmpdec-2.5.1: new features #21593 bpo-41369: Finish updating the vendored libmpdec to version 2.5.1 #24962

^{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 2021-03-30.16:12:11.820>
created_at = <Date 2020-07-22.19:27:21.605>
labels = ['extension-modules', 'type-feature', '3.10']
title = 'Update to libmpdec-2.5.1'
updated_at = <Date 2021-03-30.16:12:11.819>
user = 'https://github.com/skrah'

bugs.python.org fields:

activity = <Date 2021-03-30.16:12:11.819>
actor = 'pitrou'
assignee = 'none'
closed = True
closed_date = <Date 2021-03-30.16:12:11.820>
closer = 'pitrou'
components = ['Extension Modules']
creation = <Date 2020-07-22.19:27:21.605>
creator = 'skrah'
dependencies = []
files = []
hgrepos = []
issue_num = 41369
keywords = ['patch']
message_count = 5.0
messages = ['374101', '374103', '388206', '388230', '389836']
nosy_count = 6.0
nosy_names = ['rhettinger', 'facundobatista', 'mark.dickinson', 'pitrou', 'skrah', 'serhiy.storchaka']
pr_nums = ['21593', '24962']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue41369'
versions = ['Python 3.10']

[skrah]

This issue tracks the update of the included libmpdec to version 2.5.1.

The version includes features required for bpo-41324.

[skrah]

New changeset 9b9f158 by Stefan Krah in branch 'master':
bpo-41369 Update to libmpdec-2.5.1: new features (GH-21593)
9b9f158

[pitrou]

Stefan wrote me that the changes which complete this update are here:
master...skrah:libmpdec-2.5.1

I can turn this diff into a PR but first I want to gather feedback here. Mark, Serhiy, Raymond, what do you say?

[mdickinson]

Sounds fine to me. If I'm understanding right, what we have in master right now is somewhere between libmpdec 2.5.0 and libmpdec 2.5.1; is that right? If so, it definitely makes sense to update to 2.5.1.

[pitrou]

New changeset 73b20ae by Antoine Pitrou in branch 'master':
bpo-41369: Finish updating the vendored libmpdec to version 2.5.1 (GH-24962)
73b20ae