Merge flatcar-master to flatcar-master-edge 2019-12-03 #34
To make packages-matrix build rust sources for arm64-usr, we need to make toolchain include the rust target for arm. Unfortunately, catalyst does not support the cross-build rust target by default. We also cannot add `dev-lang/rust` to `$TOOLCHAIN_PKGS`, because then catalyst would tries to build a `cross-*/rust` package, which does not exist. So we need to manually run emerge for rust, without `--newuse -u` options. If the `--newuse -u` options are given, the rust will not be installed at all.
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