Rust

Merge pull request #3075 from cgwalters/reenable-composefs #1716

Job	Run time
build	3m 4s
build-git-libostree	6m 13s
Build, minimum supported toolchain (MSRV)	1m 42s
build-no-features	1m 53s
cargo-deny	25s
	13m 17s

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