PATH editing only needed in Windows (opencv#55)

* PATH editing only needed in Windows

* DLL load works without in Windows, too

Author: native-api

cv2/__init__.py

@@ -1,10 +1,5 @@
-import sys
-import os
 import importlib
 
-# FFmpeg dll is not found on Windows without this
-os.environ["PATH"] += os.pathsep + os.path.dirname(os.path.realpath(__file__))
-
 # make IDE's (PyCharm) autocompletion happy
 from .cv2 import *