Pete Shinners discovered that zipfile.ZipFile() is called with mode

argument "wb", while the only valid modes are "r", "w" or "a".  Fix
this by changing the mode to "w".

Lib/distutils/archive_util.py

@@ -100,7 +100,7 @@ def make_zipfile (base_name, base_dir, verbose=0, dry_run=0):
                     z.write(path, path)
 
         if not dry_run:
-            z = zipfile.ZipFile(zip_filename, "wb",
+            z = zipfile.ZipFile(zip_filename, "w",
                                 compression=zipfile.ZIP_DEFLATED)
 
             os.path.walk(base_dir, visit, z)