Add linux_rustix opt-in backend
#520
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newpavlov
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This PR replaces the `linux_rustix` opt-in backend introduced in #520 with `linux_raw` opt-in backend based raw syscalls implemented using `asm!`. It noticeably reduces dependency footprint of the crate (see concerns raised in #433). Unfortunately, it means that we have to implement the raw syscalls ourselves. This PR implements `linux_raw` support only for target arches with stable `asm!`. Nightly-only support for other targets can be added in later PRs.
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This backend can be useful for
libc-free applications and libraries. It's also used by default on*-unknown-linux-nonetargets.Closes #401
Closes #424