transpile: re-enable --reorganize-definitions
#1451
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LGTM; thanks for figuring out the library issues. I didn't realize that they were part and parcel with making the nightly-dependent refactorer a dependency of the transpile tool.
The tweaks to CLI flag definition look good.
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This is split off from #1451, but doesn't enable `--reorganize-definitions` by default, so it shouldn't need the fixes in #1452 yet, of which the disabling caching of zero values needs to be fixed. Also, I'm not sure if we should enable `--reorganize-definitions` by default, since `c2rust-refactor` won't be installed by default.
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computing these is impure because it can call `import_type`. ideally we would not disable this caching but instead cache both the initializer and its set of required imports.
Unfortunately, we have to bend over backwards to make this work without changing CLI behavior. This adds a new `--no-reorganize-definitions` flag to disable reorganizing definitions, because it would not be backwards-compatible to add an optional argument for the flag (it would eat a following argument that would previously be unassociated with the flag).
…=> unused}_reorganize_definitions` The latter is because the two fields are equal, so naming the second one `no` is misleading.
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In contrast to #1414, which this supersedes, this doesn't add
c2rust-refactoras a dependency ofc2rust, which messes uplibrustc_driver*.sodynamic dependencies and makescargo install c2rustnot work by default (stable) anymore.