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fdio: Redo tmpfile API with GLnxTmpfile struct
The core problem with the previous tmpfile code is we don't have an autocleanup that calls `unlinkat` in the non-`O_TMPFILE` case. And even if we did, it'd be awkward still since the `glnx_link_tmpfile_at()` call *consumes* the tmpfile. Fix this by introducing a struct with a cleanup macro. This simplifies a number of the callers in libostree - a notable case is where we had two arrays, one of fds, one of paths. It makes other places in libostree a bit more complex, but that's because some of the commit code paths want to deal with temporary *symlinks* too. Most callers are better though - in libglnx itself, `glnx_file_copy_at()` now correctly unlinks on failure for example.
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