Windows:  2.1a1 changes so Python runs again.  Note that the python20
subproject is gone, replaced by the new pythoncore subproject.
diff --git a/PC/python_nt.rc b/PC/python_nt.rc
index 76ec975..4554411b 100644
--- a/PC/python_nt.rc
+++ b/PC/python_nt.rc
@@ -13,7 +13,7 @@
 #define PYTHON_VERSION MS_DLL_ID "." PYTHON_API_STRING "\0"
 
 #ifndef PYTHON_DLL_NAME
-#define PYTHON_DLL_NAME "Python20.dll"
+#define PYTHON_DLL_NAME "Python21.dll"
 #endif
 
 // String Tables