Expose 'adler32_combine' function from zlib

[CallumAttryde]

BPO	38687
Nosy	@CallumAttryde
PRs	bpo-38687: Expose zlib 'adler32_combine' function to Python zlib module #17048

^{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 2019-11-04.19:11:19.739>
labels = ['extension-modules', 'type-feature', '3.9']
title = "Expose 'adler32_combine' function from zlib"
updated_at = <Date 2019-11-04.19:14:20.367>
user = 'https://github.com/CallumAttryde'

bugs.python.org fields:

activity = <Date 2019-11-04.19:14:20.367>
actor = 'callumattryde'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Extension Modules']
creation = <Date 2019-11-04.19:11:19.739>
creator = 'callumattryde'
dependencies = []
files = []
hgrepos = []
issue_num = 38687
keywords = ['patch']
message_count = 1.0
messages = ['355977']
nosy_count = 1.0
nosy_names = ['callumattryde']
pr_nums = ['17048']
priority = 'normal'
resolution = None
stage = 'patch review'
status = 'open'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue38687'
versions = ['Python 3.9']

[CallumAttryde]

zlib contains a function for combining Adler32 checksums which is not currently exposed by the Python module. This enhancement adds that function to Python

[picnixz]

Thank you for this issue. Since the PR hasn't been touched since 2019 and doesn't include tests, I'll close them and will make this part of #134635, but will nonetheless credit you as part of the work.