[jdk11u-dev] RFR: 8261350: Create implementation for NSAccessibilityCheckBox protocol peer

[Autumn Capasso]

[JDK-8261350](https://bugs.openjdk.org/browse/JDK-8261350) Merge conflict in file java.desktop/macosx/native/libawt_lwawt/awt/a11y/RadiobuttonAccessibility.m had to changed initWithCapacity. One of a series of 28 https://bugs.openjdk.org/browse/JDK-8152350

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Commit messages:
 - Backport 2b00367e1154feb2c05b84a11d62fb5750e46acf

Changes: https://git.openjdk.org/jdk11u-dev/pull/1582/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=1582&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8261350
  Stats: 122 lines in 5 files changed: 109 ins; 3 del; 10 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/1582.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev pull/1582/head:pull/1582

PR: https://git.openjdk.org/jdk11u-dev/pull/1582