etc: use codecs in featureck

this asserts that source is valid utf8

Author: richo

src/etc/featureck.py

@@ -18,7 +18,10 @@
 #     since the same version
 #   * Prints information about features
 
-import sys, os, re
+import sys
+import os
+import re
+import codecs
 
 if len(sys.argv) < 2:
     print("usage: featureck.py <src-dir>")
@@ -79,7 +82,7 @@
             continue
 
         if sys.version_info.major == 2:
-            _open = lambda f: open(f, 'r')
+            _open = lambda f: codecs.open(filename=f, mode='r', encoding="utf-8")
         elif sys.version_info.major == 3:
             _open = lambda f: open(f, 'r', encoding="utf-8")
         else: