Update zlib to 1.2.12

[antedeguemon]

This pull request bumps the built-in zlib version from 1.2.11 to 1.2.12 due to CVE-2018-25032.

The integrity of the zlib source contained in this pull request can be verified with:

# path to the internal zlib source used by otp
internal_zlib_path="./otp/erts/emulator/zlib"
# path to the up-to-date zlib source download from original zlib repository
original_zlib_path="./zlib"  

# note: '-v mk' excludes otp's custom makefile 
files=$(ls -1 $internal_zlib_path | grep -v "\.mk") 

for file in $files
do
    md5sum "$original_zlib_path/$file"
    md5sum "$internal_zlib_path/$file"    
done

Closes #5993 - see madler/zlib#605 for more details on the zlib issue.

[CLAassistant]

All committers have signed the CLA.

[github-actions]

CT Test Results

       3 files     125 suites   37m 49s ⏱️
1 445 tests 1 403 ✔️ 42 💤 0 ❌
1 744 runs  1 685 ✔️ 59 💤 0 ❌

Results for commit 204a0ad.

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// Erlang/OTP Github Action Bot

[bjorng]

Thanks for your pull request.

Since we want to release for all of our supported releases, can you please rebase the branch onto the tag OTP-23.3.4? I recommend that you squash the commit while doing so.

[antedeguemon]

@bjorng it is done! 😄

[bjorng]

Thanks! Added to our daily builds.

[bjorng]

Thanks! Now merged to maint and master, and queued for the release in the upcoming emergency patches.