8328999: Update GIFlib to 5.2.2

[gnu-andrew]

This updates the in-tree giflib to 5.2.2. The actual code changes are a clean backport, but the license file changes needed adapting from the giflib.md file in 11u and later to the THIRD_PARTY_README file in 8u (now only one copy following JDK-8338144)

8u is also missing JDK-8225487 which I've included as part of this patch. This updates the license to credit openbsd-reallocarray.c and is updated further by 8238999. I also included changes made by the 5.2.1 update which were missed because 8225487 was missing.

The giflib.md changes include some odd changes, replacing the giflib VCS URL with just tree/README. I've raised 8339271 to correct this.

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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
• JDK-8328999 needs maintainer approval

Issue

• JDK-8328999: Update GIFlib to 5.2.2 (Bug - P3)

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.org/jdk8u-dev.git pull/571/head:pull/571
$ git checkout pull/571

Update a local copy of the PR:
$ git checkout pull/571
$ git pull https://git.openjdk.org/jdk8u-dev.git pull/571/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 571

View PR using the GUI difftool:
$ git pr show -t 571

Using diff file

Download this PR as a diff file:
https://git.openjdk.org/jdk8u-dev/pull/571.diff

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[bridgekeeper]

👋 Welcome back andrew! 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]

❗ This change is not yet ready to be integrated.
See the Progress checklist in the description for automated requirements.

[openjdk]

This backport pull request has now been updated with issue from the original commit.

[mlbridge]

Webrevs

• 00: Full (d96b50f0)

[bridgekeeper]

@gnu-andrew This pull request has been inactive for more than 4 weeks and will be automatically closed if another 4 weeks passes without any activity. To avoid this, simply add a new comment to the pull request. Feel free to ask for assistance if you need help with progressing this pull request towards integration!