RFR: 8273969: Memory Leak on the Lambda provided to Platform.startup

[Florian Kirmaier]

On Sun, 19 Sep 2021 15:33:46 GMT, Florian Kirmaier <fkirmaier at openjdk.org> wrote:

> Probably my most boring PR. ;)
> Setting the lambda to null, after it has been used, fixes the leak.

For the strange reason, why i haven't used a lambda for the test, I've created another ticket: https://bugs.openjdk.java.net/browse/JDK-8273970

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PR: https://git.openjdk.java.net/jfx/pull/626