[jdk26u] RFR: 8375065: Update LCMS to 2.18

Tue Feb 10 05:06:42 UTC 2026

Hi all,

This pull request contains a backport of commit [3871b889](https://github.com/openjdk/jdk/commit/3871b8899df79fa85619975bd1c7f59792a839d1) from the [openjdk/jdk](https://git.openjdk.org/jdk) repository.

The commit being backported was authored by Damon Nguyen on 9 Feb 2026 and was reviewed by Phil Race, Sergey Bylokhov and Jayathirth D V.

Thanks!

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Commit messages:
 - Backport 3871b8899df79fa85619975bd1c7f59792a839d1

Changes: https://git.openjdk.org/jdk26u/pull/43/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk26u&pr=43&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8375065
  Stats: 189 lines in 30 files changed: 82 ins; 23 del; 84 mod
  Patch: https://git.openjdk.org/jdk26u/pull/43.diff
  Fetch: git fetch https://git.openjdk.org/jdk26u.git pull/43/head:pull/43

PR: https://git.openjdk.org/jdk26u/pull/43