8261350: Create implementation for NSAccessibilityCheckBox protocol peer

[Autumn808]

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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Issue

• JDK-8261350: Create implementation for NSAccessibilityCheckBox protocol peer

Reviewing

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[openjdk]

This backport pull request has now been updated with issue from the original commit.

[mlbridge]

Webrevs

• 00: Full (0a3f79f8)