Pushed by mh@glandium.org: https://hg.mozilla.org/integration/mozilla-inbound/rev/46d614606e25 Use the fetch task artifact for cbindgen source. r=nalexander https://hg.mozilla.org/integration/mozilla-inbound/rev/7bbfce9a61f0 Use a fetch task artifact to get rust-size source. r=nalexander https://hg.mozilla.org/integration/mozilla-inbound/rev/826d330eac68 Use a fetch task artifact to get gn source. r=nalexander https://hg.mozilla.org/integration/mozilla-inbound/rev/be7662feb259 Use a fetch task artifact to get grcov source. r=nalexander https://hg.mozilla.org/integration/mozilla-inbound/rev/c6ae39b8370a Use fetch tasks' artifacts to get sccache and openssl source. r=froydnj https://hg.mozilla.org/integration/mozilla-inbound/rev/4f02694c03e0 Use a fetch task artifact to get fxc2 source. r=nalexander https://hg.mozilla.org/integration/mozilla-inbound/rev/d770e83d5be0 Use fetch tasks' artifacts for clang-8-mingw sources. r=nalexander https://hg.mozilla.org/integration/mozilla-inbound/rev/0e079ec27475 Use a fetch task artifact for android-rs-glue source. r=nalexander