[jdk8u-dev] RFR: JDK-8285497: Add system property for Java SE specification maintenance version

[Joe Darcy]

Same diff as used in the JDK 8u RI update.

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Commit messages:
 - JDK-8285497: Add system property for Java SE specification maintenance version

Changes: https://git.openjdk.org/jdk8u-dev/pull/100/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk8u-dev&pr=100&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8285497
  Stats: 22 lines in 4 files changed: 20 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk8u-dev/pull/100.diff
  Fetch: git fetch https://git.openjdk.org/jdk8u-dev pull/100/head:pull/100

PR: https://git.openjdk.org/jdk8u-dev/pull/100