[jfx17u] RFR: 8271398: GTK3 drag view image swaps red and blue color channels

[Johan Vos]

8271398: GTK3 drag view image swaps red and blue color channels

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Commit messages:
 - Backport b2ecfacf0d8c9512d0b4cc13c1ac6c104a20f396

Changes: https://git.openjdk.org/jfx17u/pull/180/files
 Webrev: https://webrevs.openjdk.org/?repo=jfx17u&pr=180&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8271398
  Stats: 112 lines in 2 files changed: 93 ins; 18 del; 1 mod
  Patch: https://git.openjdk.org/jfx17u/pull/180.diff
  Fetch: git fetch https://git.openjdk.org/jfx17u.git pull/180/head:pull/180

PR: https://git.openjdk.org/jfx17u/pull/180