Support COM identifiers with national characters (#2632)

Some classes have them, e.g. 1C:Enterprise

Author: native-api-work

com/win32com/client/build.py

@@ -661,6 +661,9 @@ def MakePublicAttributeName(className, is_global=False):
         if ret == className:  # didn't change - force all uppercase.
             ret = ret.upper()
         return ret
+    elif className.isidentifier():
+        # some COM objects have identifiers with national characters
+        return className
     # Strip non printable chars
     return "".join([char for char in className if char in valid_identifier_chars])