Rollup merge of #138409 - xingxue-ibm:use-sigaction, r=compiler-errors
Use sa_sigaction instead of sa_union.__su_sigaction for AIX Revert test cases to use `sa_sigaction` instead of `sa_union.__su_sigaction`, now that the `libc` crate implementation for AIX defines `sa_sigaction` as a direct member of `struct sigaction`, aligning it with implementations on other similar platforms. ([[AIX] Use sa_sigaction instead of the union](https://github.com/rust-lang/libc/pull/4250)).
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