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This is a fix for the environment variable issue I reported in a PM.
Previously foreign statics would actually cause a local static to be defined and exported. This issue was found because std::env::vars() was found to return no env vars despite many being defined. This was caused by libstd importing environ as foreign static. The accidental definition of environ caused libstd to read a null pointer which was interpreted as there being no environment variables at all.
I also move rustup component installation to rust-toolchain This allows cargo check to function correctly without having to first
run prepare_build.sh. cg_clif has been using rust-toolchain too for a while now.