RFR: 8253375: OSX build fails with Xcode 12.0 (12A7209)

[Paul Hohensee]

Please review this small patch to enable the OSX build using Xcode 12.0.

Thanks,
Paul

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Commit messages:
 - JDK-8253375

Changes: https://git.openjdk.java.net/jdk/pull/348/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=348&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8253375
  Stats: 2 lines in 2 files changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.java.net/jdk/pull/348.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/348/head:pull/348

PR: https://git.openjdk.java.net/jdk/pull/348