RFR: 8329340: Remove unused libawt code [v2]

[Daniel Jeliński]

> Please review this PR that removes unused functions, variables, and WM_AWT window messages.
> 
> The unused code was detected by automated analysis (MSVC compiler and linker, CodeQL analyzer). I manually verified every symbol before removing. Mach5 client libs testing clean.
> 
> Some WM_AWT messages have different IDs after this change. The IDs have changed a few times before, so I think this shouldn't be a problem.

Daniel Jeliński has updated the pull request incrementally with two additional commits since the last revision:

 - Update copyright
 - Remove comment

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/18553/files
  - new: https://git.openjdk.org/jdk/pull/18553/files/cbf7bbd3..8041a97c

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=18553&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=18553&range=00-01

  Stats: 24 lines in 21 files changed: 0 ins; 3 del; 21 mod
  Patch: https://git.openjdk.org/jdk/pull/18553.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/18553/head:pull/18553

PR: https://git.openjdk.org/jdk/pull/18553