git: openjdk/jdk: 8204256: improve jlink error message to report unsupported class file format

[Mandy Chung]

Changeset: 5d84e95e
Author:    Ian Graves <igraves at openjdk.org>
Committer: Mandy Chung <mchung at openjdk.org>
Date:      2020-10-05 23:19:27 +0000
URL:       https://git.openjdk.java.net/jdk/commit/5d84e95e

8204256: improve jlink error message to report unsupported class file format

Reviewed-by: mchung

! src/jdk.jlink/share/classes/jdk/tools/jlink/internal/JlinkTask.java