Mitchell Hentges d925c83f15 Bug 1683797: Don't use "build targets" to build rusttests r=sheehan,firefox-build-system-reviewers,glandium ... When "build targets" are used, the sccache server isn't being used/integrated properly with make. By moving rusttests to a separate build "application", `client.mk` is invoked normally, and sccache is happy. * Move rusttests to a new build "application". * Move and denormalize rusttests mozconfigs. The new rusttests mozconfigs should expand to be mostly identical to their old versions, except with `MOZ_AUTOMATION_*=0` and `--enable-application=tools/rusttests`. They will differ a bit from their old variants because some of them originally didn't source from their respective `$app_mozconfigs/common`. * Modify `baseconfig.mk` to change tiers if running rusttests. * Adjust CI config to use new "rusttests" build application. Differential Revision: https://phabricator.services.mozilla.com/D106294		2021-03-09 14:45:25 +00:00
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