check-code: allow print and exec as a function

This is required to move forward on python3 compatibility.

contrib/check-code.py

@@ -238,7 +238,8 b' pypats = ['
     (r'class\s[^( \n]+:', "old-style class, use class foo(object)"),
     (r'class\s[^( \n]+\(\):',
      "class foo() not available in Python 2.4, use class foo(object)"),
-    (r'\b(%s)\(' % '|'.join(keyword.kwlist),
+    (r'\b(%s)\(' % '|'.join(k for k in keyword.kwlist
+                            if k not in ('print', 'exec')),
      "Python keyword is not a function"),
     (r',]', "unneeded trailing ',' in list"),
 #    (r'class\s[A-Z][^\(]*\((?!Exception)',