RFR: 8212233: javadoc fails on jdk12 with "The code being documented uses modules but the packages defined in $URL are in the unnamed module."

[Martin Buchholz]

Backport did not apply cleanly, but seemed straight forward.
https://cr.openjdk.java.net/~martin/webrevs/jdk11/JDK-8212233-backport/
https://bugs.openjdk.java.net/browse/JDK-8212233
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