md5sum: assume hashlib exists now that we're 2.7 only

tests/md5sum.py

@@ -8,17 +8,11 b''
 
 from __future__ import absolute_import
 
+import hashlib
 import os
 import sys
 
 try:
-    import hashlib
-    md5 = hashlib.md5
-except ImportError:
-    import md5
-    md5 = md5.md5
-
-try:
     import msvcrt
     msvcrt.setmode(sys.stdout.fileno(), os.O_BINARY)
     msvcrt.setmode(sys.stderr.fileno(), os.O_BINARY)
@@ -32,7 +26,7 b' for filename in sys.argv[1:]:'
         sys.stderr.write('%s: Can\'t open: %s\n' % (filename, msg))
         sys.exit(1)
 
-    m = md5()
+    m = hashlib.md5()
     try:
         for data in iter(lambda: fp.read(8192), b''):
             m.update(data)