RFR: 8299595: Remove terminally deprecated JavaFX GTK 2 library [v11]

[Thiago Milczarek Sayao]

> Simple PR to remove gtk2 library compilation and loading.

Thiago Milczarek Sayao has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains 49 additional commits since the last revision:

 - Merge branch 'master' into remove_gtk2
 - Merge branch 'openjdk:master' into master
 - Merge branch 'master' into remove_gtk2
 - Merge branch 'openjdk:master' into master
 - Rollback + Change Warnings
 - Revert "Throw exception if unsupported or invalid version specified."
   
   This reverts commit 9f8b60ff7d6045d8c35738b81a4f6a9a563129b4.
 - Throw exception if unsupported or invalid version specified.
 - Review changes
 - Improve exception
 - Check minimum gtk version
 - ... and 39 more: https://git.openjdk.org/jfx/compare/fb0da259...c75c6449

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

Changes:
  - all: https://git.openjdk.org/jfx/pull/999/files
  - new: https://git.openjdk.org/jfx/pull/999/files/c5ab9ba3..c75c6449

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jfx&pr=999&range=10
 - incr: https://webrevs.openjdk.org/?repo=jfx&pr=999&range=09-10

  Stats: 13748 lines in 405 files changed: 6828 ins; 5444 del; 1476 mod
  Patch: https://git.openjdk.org/jfx/pull/999.diff
  Fetch: git fetch https://git.openjdk.org/jfx.git pull/999/head:pull/999

PR: https://git.openjdk.org/jfx/pull/999