RFR: 8242531: [macos] JavaFX OSXPlatform tries to load nonexistent libjfxmedia_qtkit

[Alexander Matveev]

Removed code which loads nonexistent libjfxmedia_qtkit.

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Commit messages:
 - 8242531: [macos] JavaFX OSXPlatform tries to load nonexistent libjfxmedia_qtkit

Changes: https://git.openjdk.java.net/jfx/pull/597/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jfx&pr=597&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8242531
  Stats: 14 lines in 1 file changed: 0 ins; 10 del; 4 mod
  Patch: https://git.openjdk.java.net/jfx/pull/597.diff
  Fetch: git fetch https://git.openjdk.java.net/jfx pull/597/head:pull/597

PR: https://git.openjdk.java.net/jfx/pull/597