RFR: 8347752: Running RichTextArea demos via ant on JDK 24 prints warnings

[Andy Goryachev]

added

--enable-native-access=javafx.graphics --sun-misc-unsafe-memory-access=allow

flags to the command line which starts the demos.

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Commit messages:
 - 8347752: Running RichTextArea demos via ant on JDK 24 prints warnings

Changes: https://git.openjdk.org/jfx/pull/1678/files
  Webrev: https://webrevs.openjdk.org/?repo=jfx&pr=1678&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8347752
  Stats: 4 lines in 1 file changed: 0 ins; 0 del; 4 mod
  Patch: https://git.openjdk.org/jfx/pull/1678.diff
  Fetch: git fetch https://git.openjdk.org/jfx.git pull/1678/head:pull/1678

PR: https://git.openjdk.org/jfx/pull/1678