[OpenJDK 2D-Dev] RFR: 8260380: Upgrade to LittleCMS 2.12

[Phil Race]

Minor upgrade from LCMS 2.11 -> 2.12
Automated tests pass, 2D demo also looks good.

-------------

Commit messages:
 - 8260380: Upgrade to LittleCMS 2.12

Changes: https://git.openjdk.java.net/jdk/pull/2490/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=2490&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8260380
  Stats: 717 lines in 20 files changed: 249 ins; 286 del; 182 mod
  Patch: https://git.openjdk.java.net/jdk/pull/2490.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/2490/head:pull/2490

PR: https://git.openjdk.java.net/jdk/pull/2490