let's not use python 2.4 syntax yet

direct/src/showbase/PythonUtil.py

@@ -1682,7 +1682,6 @@ class Enum:
     if __debug__:
         # chars that cannot appear within an item string.
         InvalidChars = string.whitespace
-        @staticmethod
         def _checkValidIdentifier(item):
             invalidChars = string.whitespace+string.punctuation
             invalidChars = invalidChars.replace('_','')
@@ -1697,6 +1696,7 @@ class Enum:
                             "Enum\n'%s'\ncontains illegal char '%s'" %
                             (item, char))
             return 1
+        _checkValidIdentifier = staticmethod(_checkValidIdentifier)
 
     def __init__(self, items, start=0):
         if type(items) == types.StringType: