Backport #1189 and #1188 to 0.38 #1197
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Add a `rustix::fs::ABS` constant, which corresponds to the undocumented but commonly used convention of using `-EBADF` as the file descriptor in `openat` and similar calls. This makes them fail if the path is not absolute. Fixes #1187.
* Add safety comments for `mmap` etc. Add proper safety comments for `mmap` and related functions. Many of the tricky things around `mmap` are about handing out Rust references to mapped memory, and that technically isn't rustix's responsibility to worry about, so these safety comments can be pretty simple. And, several other miscellaneous documentation and comment cleanups. * Document the new safety precondition for `split_init`.
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