Cargo 0.23.0-beta, included with Rust 1.22.0-beta.2, wants to
move the top-level package description out of the [root] section
of Cargo.lock and into a parallel [[package]] section.
Accept this update by temporarily running the build without
passing --frozen and committing the result.
This is accepted by the cargo versions included in the current
and previous stable rust releases, so it will work with all
supported toolchains.
MozReview-Commit-ID: 1hMykhTknHi
--HG--
extra : rebase_source : 153d2016cd5e637584ea1d755198fbd1a5e7067e