When specifying `cbindgen` as a dependency via git, several 'skipping duplicate
package' warnings pop up regarding some of the test crates.
The warning seems to be spurious given that the test packages aren't needed when
depending on `cbindgen` (see https://github.com/rust-lang/cargo/issues/10752),
but while a fix is being considered for Cargo, this commit disambiguates the
duplicated package names by referring to their relative paths.
With lockfile v2 a version is not required for dependencies if the lock
file only contains a single entry for a specified crate. However, without
a version present, at a later stage, a dependant crate will not be found
in the metadata cache which causes the dependency to be ignored completely.
This commit tries to infer the version of dependant crates when the
version specifier is missing from the contents of the lockfile.
Ian Hobson
Bas Zalmstra