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This commit is aimed directly at rust-lang/wg-cargo-std-aware#33 and in general making the `-Zbuild-std` tests more robust. The main change here is that a new source tree is checked in, `tests/testsuite/mock-std`, which mirrors rust-lang/rust's own tree for libstd. This mock tree is as empty as it can be, ideally duplicating almost nothing but for not requiring duplication of Cargo metadata about patches and such. The end result here looks like: * All `-Zbuild-std` tests are now run in parallel * All tests run much more quickly since they're compiling tiny crates instead of actually compiling libstd/libcore * No tests require network access * We verify that crates have access to the "custom" libraries that we build Coverage of tests is not currently expanded, but it's hoped that we could add that shortly afterwards. Coverage has actually gone down slightly since the custom target test was commented out temporarily and the full integration test of running `-Zbuild-std` isn't run on CI any more. Closes rust-lang/wg-cargo-std-aware#33