RFR: 8294594: Fix cast-function-type warnings in signal handling code [v2]

[Kim Barrett]

On Tue, 11 Oct 2022 08:54:42 GMT, Kim Barrett <kbarrett at openjdk.org> wrote:

> > > For POSIX we expect the handler argument for os::signal to be a sigaction handler (taking 3 arguments). For Windows we expect os::signal to take a 1 argument handler, since Windows seemingly doesn't support the sigaction stuff. How is that a portability layer?
> 
> I'll file a bug report for this.

https://bugs.openjdk.org/browse/JDK-8295125

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PR: https://git.openjdk.org/jdk/pull/10494