Update Windows build to use xz-5.2.5

[animalize]

BPO	40859
Nosy	@pfmoore, @tjguk, @zware, @zooba, @animalize
PRs	bpo-40859: Update Windows build to use xz-5.2.5 #20622

^{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 2020-06-04.02:41:03.855>
labels = ['3.10', '3.9', 'OS-windows']
title = 'Update Windows build to use xz-5.2.5'
updated_at = <Date 2020-06-04.02:44:37.373>
user = 'https://github.com/animalize'

bugs.python.org fields:

activity = <Date 2020-06-04.02:44:37.373>
actor = 'malin'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Windows']
creation = <Date 2020-06-04.02:41:03.855>
creator = 'malin'
dependencies = []
files = []
hgrepos = []
issue_num = 40859
keywords = ['patch']
message_count = 1.0
messages = ['370693']
nosy_count = 5.0
nosy_names = ['paul.moore', 'tim.golden', 'zach.ware', 'steve.dower', 'malin']
pr_nums = ['20622']
priority = 'normal'
resolution = None
stage = 'patch review'
status = 'open'
superseder = None
type = None
url = 'https://bugs.python.org/issue40859'
versions = ['Python 3.9', 'Python 3.10']

[animalize]

The Windows build is using xz-5.2.2, it was released on 2015-09-29.
xz-5.2.5 was released recently, maybe we can update this library.

When preparing cpython-source-deps, don't forget to copy xz-5.2.5\windows\vs2019\config.h to xz-5.2.5\windows\ folder.

\vs2019\config.h and \vs2017\config.h are the same, except for the comment on the first line.

I tested xz-5.2.5 on my local machine, it passed test_lzma.py.

XZ Utils Release Notes:
https://git.tukaani.org/?p=xz.git;a=blob;f=NEWS;hb=HEAD

[gpshead]

this seem useful, but apparently something more than what is in that PR needs to be done for it to work.

[scw]

This looks like it was fixed in a few weeks after this issue was logged in the reported 3.9 and 3.10 versions on Windows.