Removes mips toolchains from the rust CI build #8
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The error we were getting was:
error: component 'rust-std' for target 'mips*' is unavailable for download for channel '*'
I have not investigated further. These toolchains are 'Tier 3' here:
https://rust-lang.github.io/rustup-components-history/
which is a likely factor for them being less supported.