Fix one compileall test (#10453).  Patch by Michele Orrù.
diff --git a/Lib/test/test_compileall.py b/Lib/test/test_compileall.py
index dd0962f..35b98f3 100644
--- a/Lib/test/test_compileall.py
+++ b/Lib/test/test_compileall.py
@@ -222,7 +222,7 @@
     def test_quiet(self):
         noise = subprocess.getoutput('{} -m compileall {}'.format(
                                      sys.executable, self.pkgdir))
-        quiet = subprocess.getoutput(('{} -m compileall {}'.format(
+        quiet = subprocess.getoutput(('{} -m compileall -f -q {}'.format(
                                      sys.executable, self.pkgdir)))
         self.assertGreater(len(noise), len(quiet))