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

[jonathan.gibbons at oracle.com]

Changeset: 8ce4083fc831
Author:    jjg
Date:      2019-01-15 11:05 -0800
URL:       http://hg.openjdk.java.net/jdk/jdk12/rev/8ce4083fc831

8212233: javadoc fails on jdk12 with "The code being documented uses modules but the packages defined in $URL are in the unnamed module."
Reviewed-by: hannesw, pmuthuswamy

! src/jdk.javadoc/share/classes/jdk/javadoc/internal/doclets/formats/html/IndexRedirectWriter.java
! src/jdk.javadoc/share/classes/jdk/javadoc/internal/doclets/toolkit/util/Extern.java
+ test/langtools/jdk/javadoc/doclet/testLinkOption/TestLinkOptionWithAutomaticModule.java