RFR: 8285792: Posix signal handler modification checking issues.

[Harold Seigel]

On Mon, 25 Jul 2022 20:50:07 GMT, Phil Race <prr at openjdk.org> wrote:

>> So the VM warnings are something of a mild annoyance that we've worked around in this test but it never made sense to me what this has to do with JNI ?

At some point it was decided that checkJNI should check for certain user defined signal handlers.  Changing that would require a CSR and is outside the scope of this pull request.

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PR: https://git.openjdk.org/jdk/pull/9631