RFR: 8278426: ImagePool uses terminally deprecated System.runFinalization method

[Andy Goryachev]

On Mon, 17 Oct 2022 14:02:52 GMT, Lukasz Kostyra <duke at openjdk.org> wrote:

> This change removes runFinalization calls in ImagePool::pruneCache method.
> 
> Finalizers are deprecated in JDK 18 and will be removed soon.

Marked as reviewed by angorya (Author).

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PR: https://git.openjdk.org/jfx/pull/918