RFR: 8299595: Remove terminally deprecated JavaFX GTK 2 library [v9]

[Thiago Milczarek Sayao]

> Simple PR to remove gtk2 library compilation and loading.

Thiago Milczarek Sayao has updated the pull request incrementally with one additional commit since the last revision:

  Throw exception if unsupported or invalid version specified.

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Changes:
  - all: https://git.openjdk.org/jfx/pull/999/files
  - new: https://git.openjdk.org/jfx/pull/999/files/8624dd27..9f8b60ff

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jfx&pr=999&range=08
 - incr: https://webrevs.openjdk.org/?repo=jfx&pr=999&range=07-08

  Stats: 270 lines in 5 files changed: 60 ins; 200 del; 10 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