Allow specifying a Rust and Go toolchain version for the build #399
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This exposes two new keyword arguments for finding the shards:
preferred_rust_version
andpreferred_go_version
, which will specify the version of the toolchain to use. Note these are implemented as strict requests for now, but I kept the "preferred" name to match the gcc and llvm arguments.I know the Rust toolchain is probably fine as a strict request, but I don't know about Go's commitment to compatibility across compiler versions.