Merge branch 'dk/p4-import-ctypes'

"git-p4" tried to use from ctypes module without first importing
it.

* dk/p4-import-ctypes:
git-p4: import the ctypes module

diff --cc git-p4.py
index daa60c60d6703ae76fd5cd168907f598207844d3,ff4113a661236f8306b0bd6ec1ced6600974c0ef..212ef2be9670bc2fe5573eee856471113eb96889
--- 1/git-p4.py
--- 2/git-p4.py
+++ b/git-p4.py
@@@ -22,8 -22,7 +22,9 @@@ import platfor
  import re
  import shutil
  import stat
 +import zipfile
 +import zlib
+ import ctypes
  
  try:
      from subprocess import CalledProcessError