Update build-using-self

Update the build-using-self to the `swift-build` and `swift-test`
executable targets are built using the native build system

Fixes: #9070

Author: bkhouri

Utilities/build-using-self

@@ -268,6 +268,8 @@ def main() -> None:
                     "swift",
                     "build",
                     *global_args,
+                    "--build-system",
+                    "native",
                     "--build-tests",
                     *ignore_args,
                     *args.additional_build_args.split(" ")
@@ -281,6 +283,8 @@ def main() -> None:
                     "swift",
                     "run",
                     *global_args,
+                    "--build-system",
+                    "native",
                     *ignore_args,
                     *args.additional_run_args.split(" "),
                     "swift-test",