RFR: 8303482: Update LCMS to 2.15

[Alisen Chung]

Updated LCMS to 2.15.
Ran clientlibs automated tests and manually checked J2Ddemo.

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Commit messages:
 - fix whitespace errors for lcms.md
 - updated md file for lcms
 - removed whitespace script
 - manual fixes for spacing
 - fix copyright header for LCMS.c
 - readded copyright header
 - removed extraneous whitespaces
 - update lcms to 2.15

Changes: https://git.openjdk.org/jdk/pull/12967/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=12967&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8303482
  Stats: 114 lines in 29 files changed: 48 ins; 12 del; 54 mod
  Patch: https://git.openjdk.org/jdk/pull/12967.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/12967/head:pull/12967

PR: https://git.openjdk.org/jdk/pull/12967