Material: py2 fix in depreciated mat file parser (back port from 0.19)

src/Mod/Material/Material.py

@@ -20,6 +20,8 @@
 # *                                                                         *
 # ***************************************************************************
 
+import sys
+
 # here the usage description if you use this tool from the command line ("__main__")
 CommandlineUsage = """Material - Tool to work with FreeCAD Material definition cards
 
@@ -62,7 +64,10 @@ def importFCMat(fileName):
 
     Config = configparser.RawConfigParser()
     Config.optionxform = str
-    Config.read(fileName, encoding='utf-8') # respect unicode filenames
+    if sys.version_info.major >= 3:
+        Config.read(fileName, encoding='utf-8')  # respect unicode filenames
+    else:
+        Config.read(fileName)
     dict1 = {}
     for section in Config.sections():
         options = Config.options(section)