In some build variations, `is_mac` or `is_linux` is true, but `target_os == "fuchsia"`. We should explicitly disable Impeller in those variants. Fixes https://github.com/flutter/flutter/issues/132793
In some build variations, `is_mac` or `is_linux` is true, but `target_os == "fuchsia"`. We should explicitly disable Impeller in those variants. Fixes https://github.com/flutter/flutter/issues/132793