[jdk11u-dev] RFR: 8328999: Update GIFlib to 5.2.2

[Martin Doerr]

Clean backport of [JDK-8328999](https://bugs.openjdk.org/browse/JDK-8328999).

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Commit messages:
 - Backport 6969a9e0b2143eee5a7cfa02460a8ab6dfa08cda

Changes: https://git.openjdk.org/jdk11u-dev/pull/2744/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=2744&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8328999
  Stats: 846 lines in 8 files changed: 179 ins; 105 del; 562 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/2744.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev.git pull/2744/head:pull/2744

PR: https://git.openjdk.org/jdk11u-dev/pull/2744