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
Bump the minimum version of the rust toolchain we require to build. The 1.15 release includes support for custom #[derive] directives, letting us use the serde serialization crate without checking in a lot of generated code. This is primarily motivated by webrender and the audio remoting work, and lets us drop the heavy syntex dependency. MozReview-Commit-ID: 6IObHhouPAn --HG-- extra : rebase_source : 4be8b148fb653a48f6df4309811ab1d8755f7edf