[py23] in PY2 shadow built-in round with round3; in PY3 simply use built-in round

Lib/fontTools/misc/py23.py

@@ -14,6 +14,10 @@ class Py23Error(NotImplementedError):
 	pass
 
 
+PY3 = sys.version_info[0] == 3
+PY2 = sys.version_info[0] == 2
+
+
 try:
 	basestring = basestring
 except NameError:
@@ -337,6 +341,13 @@ def round3(number, ndigits=None):
 	return int(d) if return_int else float(d)
 
 
+if PY2:
+	round = round3
+else:
+	import builtins
+	round = builtins.round
+
+
 import logging