stdlib/@python2: clean imports (#5453)

stdlib/@python2/xml/dom/minidom.pyi

@@ -1,4 +1,3 @@
-import sys
 import xml.dom
 from typing import IO, Any, Optional, Text as _Text, TypeVar, Union
 from xml.dom.xmlbuilder import DocumentLS, DOMImplementationLS

stdlib/@python2/xml/etree/ElementInclude.pyi

@@ -1,4 +1,3 @@
-import sys
 from typing import Callable, Optional, Union
 from xml.etree.ElementTree import Element
 

stdlib/@python2/xml/etree/ElementTree.pyi

@@ -1,5 +1,4 @@
-import sys
-from _typeshed import AnyPath, FileDescriptor, SupportsWrite
+from _typeshed import AnyPath, FileDescriptor
 from typing import (
     IO,
     Any,
@@ -20,7 +19,6 @@ from typing import (
     Union,
     overload,
 )
-from typing_extensions import Literal
 
 VERSION: str
 

stdlib/@python2/xml/sax/__init__.pyi

@@ -1,5 +1,4 @@
-import sys
-from typing import IO, Any, Iterable, List, NoReturn, Optional, Text, Union
+from typing import IO, Any, List, NoReturn, Optional, Text, Union
 from xml.sax.handler import ContentHandler, ErrorHandler
 from xml.sax.xmlreader import Locator, XMLReader
 

stdlib/@python2/xml/sax/saxutils.pyi

@@ -1,4 +1,3 @@
-import sys
 from _typeshed import SupportsWrite
 from codecs import StreamReaderWriter, StreamWriter
 from io import RawIOBase, TextIOBase