remove the 't' mode for codecs.open

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxPython/Phoenix/trunk@71566 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

buildtools/config.py

@@ -784,6 +784,7 @@ def textfile_open(filename, mode='rt'):
     assert 't' in mode
     if sys.version_info < (3,):
         import codecs
+        mode = mode.replace('t', '')
         return codecs.open(filename, mode, encoding='utf-8')
     else:
         return open(filename, mode, encoding='utf-8')