[jdk17u] RFR: 8269269: [macos11] SystemIconTest fails with ClassCastException

[Alex Kasko]

On Fri, 1 Oct 2021 16:38:27 GMT, Alex Kasko <akasko at openjdk.org> wrote:

> Clean backport of the test-only Mac-specific fix.
> 
> Testing: checked that the test fails on Mac without the patch, checked that changed test passes on Linux, Windows and Mac.

Marked the bug for approval.

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PR: https://git.openjdk.java.net/jdk17u/pull/142