hg: jdk/sandbox: 8240910: jmod rejects duplicate entries in --class-path jars

[chris.hegarty at oracle.com]

Changeset: 4c6190f99f3a
Author:    mchung
Date:      2020-05-08 08:23 -0700
URL:       https://hg.openjdk.java.net/jdk/sandbox/rev/4c6190f99f3a

8240910: jmod rejects duplicate entries in --class-path jars
Reviewed-by: alanb, lancea

! src/jdk.jlink/share/classes/jdk/tools/jmod/JmodOutputStream.java
! src/jdk.jlink/share/classes/jdk/tools/jmod/JmodTask.java
! test/jdk/tools/jmod/JmodTest.java