RFR: 8270547: java.util.Random contains unnecessary @SuppressWarnings("exports")

[Jan Lahoda]

Removing unnecessary `@SuppressWarnings("exports")`. The reason for the suppress warnings was, as far as I can tell, removed by https://bugs.openjdk.java.net/browse/JDK-8265137.

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Commit messages:
 - 8270547: java.util.Random contains unnecessary @SuppressWarnings("exports")

Changes: https://git.openjdk.java.net/jdk/pull/4793/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=4793&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8270547
  Stats: 1 line in 1 file changed: 0 ins; 1 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/4793.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/4793/head:pull/4793

PR: https://git.openjdk.java.net/jdk/pull/4793