[crac] RFR: Fix OSX failure in SunMiscSignalTest

[Anton Kozlov]

On Fri, 6 Oct 2023 13:13:00 GMT, Radim Vansa <rvansa at openjdk.org> wrote:

> Fixes GHA failure in SunMiscSignalTest on OSX

LGTM for now, but later we'll probably enable the same protocol between engine and VM on all platforms, which is based on signals.

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Marked as reviewed by akozlov (Lead).

PR Review: https://git.openjdk.org/crac/pull/123#pullrequestreview-1732678181