Fix EncodingWarnings in text_file.py. Ref #232.

distutils/text_file.py

@@ -115,7 +115,7 @@ def open(self, filename):
         """Open a new file named 'filename'.  This overrides both the
         'filename' and 'file' arguments to the constructor."""
         self.filename = filename
-        self.file = open(self.filename, errors=self.errors)
+        self.file = open(self.filename, errors=self.errors, encoding='utf-8')
         self.current_line = 0
 
     def close(self):