package plist.pxd for cython

package plist.pxd for cython

or we get error:
$ python -c "import imobilesync"
Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "/usr/share/python2.7/site-packages/imobilesync/__init__.py", line 1, in <module>
  File "/usr/share/python2.7/site-packages/imobilesync/data/__init__.py", line 1, in <module>
  File "/usr/share/python2.7/site-packages/imobilesync/data/base.py", line 2, in <module>
  File "/usr/share/python2.7/site-packages/imobilesync/sync.py", line 1, in <module>
  File "plist.pxd", line 6, in init imobiledevice (imobiledevice.c:29961)
ValueError: plist.Node has the wrong size, try recompiling