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

[shipilev]

Need this to unblock MacOS compiler update in GHA.

Partially backports original openjdk/jdk@b06f1b1. There are lots of conflicts, because:

1. The original JDK-8294314 that added more verbose build warnings is not in 17u-dev yet.
2. The JDK-8292054 that added the /test/hotspot/gtest/runtime/test_signals.cpp is also not present in 17u-dev.

Additional testing:

• Linux AArch64 server fastdebug, all
• Linux x86_64 server fastdebug, all

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Progress

• Change must be properly reviewed (1 review required, with at least 1 Reviewer)
• Change must not contain extraneous whitespace
• Commit message must refer to an issue
• JDK-8294594 needs maintainer approval

Issue

• JDK-8294594: Fix cast-function-type warnings in signal handling code (Bug - P4)

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.org/jdk17u-dev.git pull/4125/head:pull/4125
$ git checkout pull/4125

Update a local copy of the PR:
$ git checkout pull/4125
$ git pull https://git.openjdk.org/jdk17u-dev.git pull/4125/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 4125

View PR using the GUI difftool:
$ git pr show -t 4125

Using diff file

Download this PR as a diff file:
https://git.openjdk.org/jdk17u-dev/pull/4125.diff

[bridgekeeper]

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[openjdk]

❗ This change is not yet ready to be integrated.
See the Progress checklist in the description for automated requirements.

[openjdk]

This backport pull request has now been updated with issue from the original commit.