Set PYTHONPATH="" when running through wine

Without this, it's possible for the Linux PYTHONPATH to leak through
and mixing up the PyCrypto libraries being called (or possibly
exceeding the allowed length of the PYTHONPATH in wine).

DeDRM_plugin/wineutils.py

@@ -28,9 +28,9 @@ def WineGetKeys(scriptpath, extension, wineprefix=""):
         wineprefix = os.path.abspath(os.path.expanduser(os.path.expandvars(wineprefix)))
 
     if wineprefix != "" and os.path.exists(wineprefix):
-         cmdline = "WINEPREFIX=\"{2}\" wine python.exe \"{0}\" \"{1}\"".format(scriptpath,outdirpath,wineprefix)
+         cmdline = "PYTHONPATH=\"\" WINEPREFIX=\"{2}\" wine python.exe \"{0}\" \"{1}\"".format(scriptpath,outdirpath,wineprefix)
     else:
-        cmdline = "wine python.exe \"{0}\" \"{1}\"".format(scriptpath,outdirpath)
+        cmdline = "PYTHONPATH=\"\" wine python.exe \"{0}\" \"{1}\"".format(scriptpath,outdirpath)
     print("{0} v{1}: Command line: '{2}'".format(PLUGIN_NAME, PLUGIN_VERSION, cmdline))
 
     try:
@@ -40,9 +40,9 @@ def WineGetKeys(scriptpath, extension, wineprefix=""):
     except Exception as e:
         print("{0} v{1}: Wine subprocess call error: {2}".format(PLUGIN_NAME, PLUGIN_VERSION, e.args[0]))
         if wineprefix != "" and os.path.exists(wineprefix):
-            cmdline = "WINEPREFIX=\"{2}\" wine C:\\Python27\\python.exe \"{0}\" \"{1}\"".format(scriptpath,outdirpath,wineprefix)
+            cmdline = "PYTHONPATH=\"\" WINEPREFIX=\"{2}\" wine C:\\Python27\\python.exe \"{0}\" \"{1}\"".format(scriptpath,outdirpath,wineprefix)
         else:
-           cmdline = "wine C:\\Python27\\python.exe \"{0}\" \"{1}\"".format(scriptpath,outdirpath)
+           cmdline = "PYTHONPATH=\"\" wine C:\\Python27\\python.exe \"{0}\" \"{1}\"".format(scriptpath,outdirpath)
         print("{0} v{1}: Command line: “{2}”".format(PLUGIN_NAME, PLUGIN_VERSION, cmdline))
 
         try: