RFR: JDK-8312461 JNI warnings in SunMSCApi provider

[Mark Powers]

https://bugs.openjdk.org/browse/JDK-8312461

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Commit messages:
 - Merge
 - first iteration

Changes: https://git.openjdk.org/jdk/pull/15113/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=15113&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8312461
  Stats: 5 lines in 1 file changed: 5 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/15113.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/15113/head:pull/15113

PR: https://git.openjdk.org/jdk/pull/15113