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The `target_cpu` local is only used if `use_rbe` is true. Move its
definition into the `use_rbe` block to avoid local build issues like
```
$ ninja -C engine/src/out/ci/fuchsia_debug_arm64
ERROR at //build/toolchain/fuchsia/BUILD.gn:13:19: Assignment had no effect.
target_triple = "aarch64-unknown-fuchsia"
^------------------------
You set the variable "target_triple" here and it was unused before it went
out of scope.
```