fa16babc4 Use goma-aware Fuchsia clang toolchain (flutter/engine#9430) (#34893)

https://github.com/flutter/engine/compare/e32307e9f140...fa16babc4537

git log e32307e9f1409c9f0518956d9c695c1105565201..fa16babc4537967c065605e4e184b206869da1f6 --no-merges --oneline
fa16babc4 Use goma-aware Fuchsia clang toolchain (flutter/engine#9430)

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bin/internal/engine.version

-e32307e9f1409c9f0518956d9c695c1105565201
+fa16babc4537967c065605e4e184b206869da1f6