update windows build to Python 3.7

Lib/xml/parsers/__init__.py

@@ -0,0 +1,8 @@
+"""Python interfaces to XML parsers.
+
+This package contains one module:
+
+expat -- Python wrapper for James Clark's Expat parser, with namespace
+         support.
+
+"""

Lib/xml/parsers/expat.py

@@ -0,0 +1,8 @@
+"""Interface to the Expat non-validating XML parser."""
+import sys
+
+from pyexpat import *
+
+# provide pyexpat submodules as xml.parsers.expat submodules
+sys.modules['xml.parsers.expat.model'] = model
+sys.modules['xml.parsers.expat.errors'] = errors