fix builtins import

Author: jck

myhdl/_intbv.py

@@ -24,8 +24,7 @@
 maxint = sys.maxint
 import operator
 
-from myhdl._compat import long, integer_types, string_types
-from myhdl._compat.builtins import max as maxfunc
+from myhdl._compat import long, integer_types, string_types, builtins
 from myhdl._bin import bin
 
 
@@ -47,7 +46,7 @@ def __init__(self, val=0, min=None, max=None, _nrbits=0):
                     _nrbits = len(bin(min))
                 else:
                     # make sure there is a leading zero bit in positive numbers
-                    _nrbits = maxfunc(len(bin(max-1))+1, len(bin(min)))
+                    _nrbits = builtins.max(len(bin(max-1))+1, len(bin(min)))
         if isinstance(val, integer_types):
             self._val = val
         elif isinstance(val, string_types):