Clean up unused imports

Signed-off-by: Priit Laes <plaes@plaes.org>

data.py

@@ -93,8 +93,6 @@ class PathList:
     def pack (self):
         return self.data
 
-from io import BytesIO
-
 class RefList:
     def __init__ (self, data=b''):
         self.data = data

lib.py

@@ -19,8 +19,6 @@
 #  along with Elixir.  If not, see <http://www.gnu.org/licenses/>.
 
 import subprocess
-import re
-import sys
 
 def script (*args):
     args = ('./script.sh',) + args

update.py

@@ -19,7 +19,7 @@
 #  along with Elixir.  If not, see <http://www.gnu.org/licenses/>.
 
 from sys import argv
-from lib import script, scriptLines
+from lib import scriptLines
 import lib
 import data
 import os