Build script updates for syncing engine sources and building artifacts on linux-arm64 (#186917) https://github.com/flutter/flutter/pull/182552 added support in the Flutter tools for using a version of gen_snapshot that runs on linux-arm64 hosts and targets Android devices. However, the engine build infrastructure is not currently set up to build this kind of gen_snapshot binary. This PR contains changes needed to build engine artifacts on linux-arm64 machines. With this PR a linux-arm64 build environment can: * run "gclient sync" * build targets like zip_archives/android-arm64-profile/linux-arm64.zip that were added in https://github.com/flutter/flutter/pull/182552 |