Reduce Xcode noise #3 (#14663)

* Revert "Revert "Reduce xcodebuild noise #2" (#14641)"

This reverts commit 2d47481f1e48d744bcbd7d4b33ab9cc5ef2de8e1.

* Stop scrapping xcodebuild output, get the right build settings

* clone the command params first
diff --git a/packages/flutter_tools/bin/xcode_backend.sh b/packages/flutter_tools/bin/xcode_backend.sh
index 6f52669..fc1539a 100755
--- a/packages/flutter_tools/bin/xcode_backend.sh
+++ b/packages/flutter_tools/bin/xcode_backend.sh
@@ -4,7 +4,9 @@
 # found in the LICENSE file.
 
 RunCommand() {
-  echo "♦ $*"
+  if [[ -n "$VERBOSE_SCRIPT_LOGGING" ]]; then
+    echo "♦ $*"
+  fi
   "$@"
   return $?
 }