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fdio: Add cleanup+flush API for FILE*
Mostly in ostree/rpm-ostree, we work in either raw `int fd`, or `G{Input,Output}Stream`. One exception is the rpm-ostree `/etc/passwd` handling, which uses `FILE*` since that's what glibc exposes. And in general, there are use cases for `FILE*`; the raw `GUnixOutputStream` for example isn't buffered, and doing so via e.g. `GBufferedOutputStream` means allocating *two* GObjects and even worse going through multiple vfuncs for every write. `FILE*` is used heavily in systemd, and provides buffering. It is a bit cheaper than gobjects, but has its own trap; by default every operation locks a mutex. For more information on that, see `unlocked_stdio(3)`. However, callers can avoid that by using e.g. `fwrite_unlocked`, which I plan to do for most users of `FILE*` that aren't writing to one of the standard streams like `stdout` etc.
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