JDK-8305815: Update Libpng to 1.6.39

[honkar-jdk]

Updated libpng from 1.6.38 to 1.6.39.

• libpng.md file updated accordingly
• src code files updated from upstream

CIient (CI Testing) and SplashScreen related tests work as expected with the changes.

---

Progress

• Change must be properly reviewed (1 review required, with at least 1 Reviewer)
• Change must not contain extraneous whitespace
• Commit message must refer to an issue

Issue

• JDK-8305815: Update Libpng to 1.6.39

Reviewers

• Phil Race (@prrace - Reviewer)

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.org/jdk.git pull/13755/head:pull/13755
$ git checkout pull/13755

Update a local copy of the PR:
$ git checkout pull/13755
$ git pull https://git.openjdk.org/jdk.git pull/13755/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 13755

View PR using the GUI difftool:
$ git pr show -t 13755

Using diff file

Download this PR as a diff file:
https://git.openjdk.org/jdk/pull/13755.diff

Webrev

Link to Webrev Comment

[bridgekeeper]

👋 Welcome back honkar! A progress list of the required criteria for merging this PR into master will be added to the body of your pull request. There are additional pull request commands available for use with this pull request.

[openjdk]

@honkar-jdk The following label will be automatically applied to this pull request:

• client

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[mlbridge]

Webrevs

• 00: Full (c1256745)

[honkar-jdk]

@prrace Please review

[mrserb]

Please add a note about what testing was done for this patch.

[honkar-jdk]

Please add a note about what testing was done for this patch.

@mrserb Updated the PR description with testing info.

[openjdk]

@honkar-jdk This change now passes all automated pre-integration checks.

ℹ️ This project also has non-automated pre-integration requirements. Please see the file CONTRIBUTING.md for details.

After integration, the commit message for the final commit will be:

8305815: Update Libpng to 1.6.39

Reviewed-by: prr

You can use pull request commands such as /summary, /contributor and /issue to adjust it as needed.

At the time when this comment was updated there had been 29 new commits pushed to the master branch:

• 705ad7d: 8306014: Update javax.net.ssl TLS tests to use SSLContextTemplate or SSLEngineTemplate
• 3930709: 8068925: Add @OverRide in javax.tools classes
• fc76687: 8306836: Remove pinned tag for G1 heap regions
• ccf91f8: 8306933: C2: "assert(false) failed: infinite loop" failure
• e9807a4: 8306042: C2: failed: Missed optimization opportunity in PhaseCCP (adding LShift->Cast->Add notification)
• fcb280a: 8305092: Improve Thread.sleep(millis, nanos) for sub-millisecond granularity
• 891530f: 8307005: Make CardTableBarrierSet::initialize non-virtual
• e0774be: 8306997: C2: "malformed control flow" assert due to missing safepoint on backedge with a switch
• 462b1df: 8307106: Allow concurrent GCs to walk CLDG without ClassLoaderDataGraph_lock
• c8f3756: 8306729: Add nominal descriptors of modules and packages to Constants API
• ... and 19 more: https://git.openjdk.org/jdk/compare/561ec9c5a06e5baeb0cf72463d14d1d720facb13...master

As there are no conflicts, your changes will automatically be rebased on top of these commits when integrating. If you prefer to avoid this automatic rebasing, please check the documentation for the /integrate command for further details.

➡️ To integrate this PR with the above commit message to the master branch, type /integrate in a new comment.

[honkar-jdk]

/integrate

[openjdk]

Going to push as commit 1487477.
Since your change was applied there have been 29 commits pushed to the master branch:

• 705ad7d: 8306014: Update javax.net.ssl TLS tests to use SSLContextTemplate or SSLEngineTemplate
• 3930709: 8068925: Add @OverRide in javax.tools classes
• fc76687: 8306836: Remove pinned tag for G1 heap regions
• ccf91f8: 8306933: C2: "assert(false) failed: infinite loop" failure
• e9807a4: 8306042: C2: failed: Missed optimization opportunity in PhaseCCP (adding LShift->Cast->Add notification)
• fcb280a: 8305092: Improve Thread.sleep(millis, nanos) for sub-millisecond granularity
• 891530f: 8307005: Make CardTableBarrierSet::initialize non-virtual
• e0774be: 8306997: C2: "malformed control flow" assert due to missing safepoint on backedge with a switch
• 462b1df: 8307106: Allow concurrent GCs to walk CLDG without ClassLoaderDataGraph_lock
• c8f3756: 8306729: Add nominal descriptors of modules and packages to Constants API
• ... and 19 more: https://git.openjdk.org/jdk/compare/561ec9c5a06e5baeb0cf72463d14d1d720facb13...master

Your commit was automatically rebased without conflicts.

[openjdk]

@honkar-jdk Pushed as commit 1487477.

💡 You may see a message that your pull request was closed with unmerged commits. This can be safely ignored.