<AWT Dev> RFR: 8261351: Create implementation for NSAccessibilityRadioButton protocol

[Alexander Zuev]

8261351: Create implementation for NSAccessibilityRadioButton protocol

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Commit messages:
 - 8261351: Create implementation for NSAccessibilityRadioButton protocol

Changes: https://git.openjdk.java.net/jdk/pull/2561/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=2561&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8261351
  Stats: 47 lines in 3 files changed: 44 ins; 0 del; 3 mod
  Patch: https://git.openjdk.java.net/jdk/pull/2561.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/2561/head:pull/2561

PR: https://git.openjdk.java.net/jdk/pull/2561