Remove unused support.run_unittest imports.
It is not needed since tests use unittest.main().
diff --git a/Lib/test/test_charmapcodec.py b/Lib/test/test_charmapcodec.py
index 4064aef..0d4594d 100644
--- a/Lib/test/test_charmapcodec.py
+++ b/Lib/test/test_charmapcodec.py
@@ -9,7 +9,7 @@
 
 """#"
 
-import test.support, unittest
+import unittest
 
 import codecs