RFR: 8299595: Remove terminally deprecated JavaFX GTK 2 library [v10]

[Thiago Milczarek Sayao]

> Simple PR to remove gtk2 library compilation and loading.

Thiago Milczarek Sayao has updated the pull request incrementally with two additional commits since the last revision:

 - Rollback + Change Warnings
 - Revert "Throw exception if unsupported or invalid version specified."
   
   This reverts commit 9f8b60ff7d6045d8c35738b81a4f6a9a563129b4.

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Changes:
  - all: https://git.openjdk.org/jfx/pull/999/files
  - new: https://git.openjdk.org/jfx/pull/999/files/9f8b60ff..c5ab9ba3

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jfx&pr=999&range=09
 - incr: https://webrevs.openjdk.org/?repo=jfx&pr=999&range=08-09

  Stats: 267 lines in 5 files changed: 201 ins; 59 del; 7 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