[jdk17u-dev] RFR: 8273387: remove some unreferenced gtk-related functions

[Matthias Baesken]

8273387: remove some unreferenced gtk-related functions

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Commit messages:
 - Backport 6eba443428ff7abe7c0509047ec76432affebe65

Changes: https://git.openjdk.java.net/jdk17u-dev/pull/65/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk17u-dev&pr=65&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8273387
  Stats: 68 lines in 2 files changed: 0 ins; 66 del; 2 mod
  Patch: https://git.openjdk.java.net/jdk17u-dev/pull/65.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk17u-dev pull/65/head:pull/65

PR: https://git.openjdk.java.net/jdk17u-dev/pull/65