Patch from niki@vintech.bg allowing builds for Python 2.5 (using MSVC 7.1) to work again.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@73184 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

build/tools/build-wxwidgets.py

@@ -60,6 +60,8 @@ def getXcodePath():
 
 def getVisCVersion():
     text = getoutput("cl.exe")
+    if 'Version 13' in text:
+        return '71'
     if 'Version 15' in text:
         return '90'
     # TODO: Add more tests to get the other versions...