Fix execfile compatibility layer for Python 2 on non-Windows platforms.

IPython/utils/py3compat.py

@@ -164,9 +164,9 b' else:'
                 filename = fname
             exec compile(scripttext, filename, 'exec') in glob, loc
     else:
-        def execfile(fname, glob=None, loc=None):
+        def execfile(fname, *where):
             if isinstance(fname, unicode):
                 filename = fname.encode(sys.getfilesystemencoding())
             else:
                 filename = fname
-            __builtin__.execfile(filename, glob, loc)
+            __builtin__.execfile(filename, *where)