ensure sfx externals have deterministic ordering
ensure sfx externals have deterministic ordering

systemjs/builder,whitneyit/builder,lookfirst/builder,lookfirst/builder,systemjs/builder,jrauschenbusch/builder,whitneyit/builder,alexisvincent/builder,alexisvincent/builder,alexisvincent/builder,jrauschenbusch/builder,jrauschenbusch/builder,systemjs/builder