[jdk11u-dev] RFR: 7124301: [macosx] When in a tab group if you arrow between tabs there are no VoiceOver announcements.

[Martin Doerr]

Backport of [JDK-7124301](https://bugs.openjdk.java.net/browse/JDK-7124301)
Applies cleanly, but requires a trivial replacement:
JNF_COCOA_ENTER => JNI_COCOA_ENTER
JNF_COCOA_EXIT => JNI_COCOA_EXIT

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Depends on: https://git.openjdk.java.net/jdk11u-dev/pull/1097

Commit messages:
 - Backport 2146e52cfa2d9442ab80f4a0dea30c821e953657

Changes: https://git.openjdk.java.net/jdk11u-dev/pull/1099/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk11u-dev&pr=1099&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-7124301
  Stats: 33 lines in 3 files changed: 30 ins; 0 del; 3 mod
  Patch: https://git.openjdk.java.net/jdk11u-dev/pull/1099.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk11u-dev pull/1099/head:pull/1099

PR: https://git.openjdk.java.net/jdk11u-dev/pull/1099