Merge #1886

1886: Update use of libc::timespec to prepare for future libc version r=asomers a=wesleywiser

In a future release of the `libc` crate, `libc::timespec` will contain private padding fields on `*-linux-musl` targets and so the struct will no longer be able to be created using the literal initialization syntax.

Update places where `libc::timespec` is created to first zero initialize the value and then update the `tv_sec` and `tv_nsec` fields manually. Many of these places are in `const fn`s so a helper function `zero_init_timespec()` is introduced to help with this as `std::mem::MaybeUninit::zeroed()` is not a `const` function.

Some matches on `libc::timespec` are also updated to include a trailing `..` pattern which works when `libc::timespec` has additional, private fields as well as when it does not (like for
`x86_64-unknown-linux-gnu`).

See also https://github.com/rust-lang/libc/pull/2088

Co-authored-by: Wesley Wiser <wesleywiser@microsoft.com>

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