<AWT Dev> RFR: 8261198: [macOS] Incorrect JNI parameters in number conversion in A1Y code.

[Phil Race]

we need to specify ()I for the signature of the method that returns int.
Additionally number (the instance!) needs to be passed to the method up call.

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Commit messages:
 - 8261198: [macOS] Incorrect JNI parameters in number conversion in A11Y code

Changes: https://git.openjdk.java.net/jdk/pull/2418/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=2418&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8261198
  Stats: 3 lines in 1 file changed: 0 ins; 0 del; 3 mod
  Patch: https://git.openjdk.java.net/jdk/pull/2418.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/2418/head:pull/2418

PR: https://git.openjdk.java.net/jdk/pull/2418