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

[Aleksey Shipilev]

On Sun, 9 Oct 2022 05:39:26 GMT, Kim Barrett <kbarrett at openjdk.org> wrote:

>> After [JDK-8294314](https://bugs.openjdk.org/browse/JDK-8294314), we would have signals_posix.cpp excluded with cast-function-type warning:
>
> make/hotspot/lib/CompileJvm.gmk line 147:
> 
>> 145: # Now set up the actual compilation of the main hotspot native library
>> 146: 
>> 147: # TODO: Should merge once JDK-8294314 is in.
> 
> Left-over comment should be removed.

I shall, once JDK-8294314 integrates. I am keeping those build changes to force a merge conflict.

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