RFR: 7903856: apidiff: 7903837 breaks some builds

[Christian Stein]

On Wed, 2 Oct 2024 03:39:06 GMT, Jonathan Gibbons <jjg at openjdk.org> wrote:

> Please review a small but important fix for an issue handling EQUINOX_JAR in some build environments.
> 
> The underlying issue is that EQUINOX_JAR may or may not be required, depending on the configuration for DAISYDIFF.

Works on Windows

-------------

Marked as reviewed by cstein (Committer).

PR Review: https://git.openjdk.org/apidiff/pull/22#pullrequestreview-2342015897