RFR: 8299595: Remove terminally deprecated JavaFX GTK 2 library [v4]

[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 38 additional commits since the last revision:

 - Remove unwanted file
 - Merge branch 'master' into remove_gtk2
 - Merge branch 'openjdk:master' into master
 - Merge branch 'openjdk:master' into master
 - Merge branch 'openjdk:master' into master
 - Merge branch 'openjdk:master' into master
 - Merge branch 'openjdk:master' into master
 - Review changes
 - Improve SWT detection
 - Pre-review adjustments
 - ... and 28 more: https://git.openjdk.org/jfx/compare/7774f8b2...881f85f3

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Changes:
  - all: https://git.openjdk.org/jfx/pull/999/files
  - new: https://git.openjdk.org/jfx/pull/999/files/a1ae52d8..881f85f3

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jfx&pr=999&range=03
 - incr: https://webrevs.openjdk.org/?repo=jfx&pr=999&range=02-03

  Stats: 199154 lines in 5643 files changed: 117890 ins; 43083 del; 38181 mod
  Patch: https://git.openjdk.org/jfx/pull/999.diff
  Fetch: git fetch https://git.openjdk.org/jfx pull/999/head:pull/999

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