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49077c59a8
Misc CI improvements This PR contains some misc improvements to our CI configuration: * The environment variables for MinGW builders were greatly simplified, with just `CUSTOM_MINGW=1` to tell the install scripts to install the vendored copy. All the others (`MINGW_URL`, `MINGW_DIR`, `MINGW_ARCHIVE` and `MSYS_BITS`) are detected either from the builder name or the environment. * Collecting CPU stats and running the build were moved into scripts. * Toolstate scripts validation was previously a separate step, ran just when `IMAGE=mingw-check`. This moves the validation code inside the actual image. * Vendored copies are now fetched from https://ci-mirrors.rust-lang.org instead of directly from the bucket. r? @alexcrichton