Update GifLIB to version 6.1.2. There were only a few changes across two source files. Tested the changes in CI and through manual tests.
------------- Commit messages: - Initial commit Changes: https://git.openjdk.org/jdk/pull/30286/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=30286&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8380078 Stats: 10 lines in 3 files changed: 8 ins; 0 del; 2 mod Patch: https://git.openjdk.org/jdk/pull/30286.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/30286/head:pull/30286 PR: https://git.openjdk.org/jdk/pull/30286
