[jdk16u] RFR: 8253702: BigSur version number reported as 10.16, should be 11.nn

[Christoph Langer]

Backport JDK-8253702

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Commit messages:
 - Backport 66757750a2adf0739d0f5bf98a3f50a123b7adcf

Changes: https://git.openjdk.java.net/jdk16u/pull/35/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk16u&pr=35&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8253702
  Stats: 30 lines in 1 file changed: 22 ins; 2 del; 6 mod
  Patch: https://git.openjdk.java.net/jdk16u/pull/35.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk16u pull/35/head:pull/35

PR: https://git.openjdk.java.net/jdk16u/pull/35