RFR: 8253753 Enable default constructor warning in client modules

[Joe Darcy]

With the default constructors warnings in java.desktop and jdk.accessibility now fixed, the warning should be enabled in the build for those modules.

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Commit messages:
 - Merge branch 'JDK-8253753' of https://github.com/jddarcy/jdk into JDK-8253753
 - Update build to enable default constructor warning in client modules.
 - Update build to enable default constructor warning in client modules.

Changes: https://git.openjdk.java.net/jdk/pull/1420/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=1420&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8253753
  Stats: 5 lines in 1 file changed: 0 ins; 5 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/1420.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/1420/head:pull/1420

PR: https://git.openjdk.java.net/jdk/pull/1420