Added `sigaction_is_default()`, `sigaction_is_ignore()`, and `sigaction_current()` functions#2190

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cpick wants to merge 4 commits intonix-rust:masterfrom cpick:sigaction

+92-7

Commits on Nov 14, 2023

Restore handler in test_old_sigaction_flags()
Chris Pick
committed
Add signal::sigaction_current()
Chris Pick
committed
Add signal::sigaction_is_{default,ignore}()
Chris Pick
committed
Add changelog/2190.added.md
Chris Pick
committed