hg: jdk/jdk: 8240169: javadoc fails to link to non-modular api docs

[hannes.wallnoefer at oracle.com]

Changeset: 3b557aef43c4
Author:    hannesw
Date:      2020-04-08 22:04 +0200
URL:       https://hg.openjdk.java.net/jdk/jdk/rev/3b557aef43c4

8240169: javadoc fails to link to non-modular api docs
Reviewed-by: jjg

! src/jdk.javadoc/share/classes/jdk/javadoc/internal/doclets/toolkit/util/Extern.java
! test/langtools/jdk/javadoc/doclet/testClassCrossReferences/TestClassCrossReferences.java
! test/langtools/jdk/javadoc/doclet/testLinkOption/TestLinkOptionWithModule.java