add qsort_r for unix, and qsort and qsort_s for windows

[folkertdev]

Description

Add qsort_r for apple, freebsd and netbsd targets, and qsort and qsort_s for windows targets.

Sources

• https://linux.die.net/man/3/qsort_r
• https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man3/qsort_r.3.html
• https://learn.microsoft.com/en-us/cpp/c-runtime-library/reference/qsort?view=msvc-170
• https://learn.microsoft.com/en-us/cpp/c-runtime-library/reference/qsort-s?view=msvc-170
• https://man.freebsd.org/cgi/man.cgi?query=qsort_r&sektion=3&format=html
• https://man.netbsd.org/qsort.3

Checklist

• Relevant tests in libc-test/semver have been updated
• No placeholder or unstable values like *LAST or *MAX are
  included (see #3131)
• Tested locally (cd libc-test && cargo test --target mytarget);
  especially relevant for platforms that may not be checked in CI

[rustbot]

Some changes occurred in OpenBSD module

cc @semarie

[semarie]

`qsort_r` doesn't exist in OpenBSD, but the NetBSD definition is placed in common file. Please move the definition in NetBSD specific file. Thanks

[folkertdev]

Sure, I moved the definition to src/unix/bsd/netbsdlike/netbsd/mod.rs, and I believe the semver entry was already correct.