fix missing import

Author: briantoby

GSASII/GSASIIphsGUI2.py

@@ -6,7 +6,7 @@
 all others are in GSASIIphsGUI.py
 '''
 from __future__ import division, print_function
-#import platform
+import platform
 import os
 import wx
 import wx.grid as wg