Re-disable windows SMP frozen support

The recommended workaround didn't work.

src/bitmessagemain.py

@@ -18,7 +18,6 @@ import singleton
 import os
 import socket
 import ctypes
-from multiprocessing import Process, freeze_support
 from struct import pack
 import sys
 from subprocess import call
@@ -266,7 +265,6 @@ class Main:
         return {'address':address,'port':port}
 
 if __name__ == "__main__":
-    freeze_support()
     mainprogram = Main()
     mainprogram.start()
 

src/proofofwork.py

@@ -151,6 +151,15 @@ def run(target, initialHash):
             return _doCPoW(target, initialHash)
         except:
             pass # fallback
+    if frozen == "macosx_app" or not frozen:
+        # on my (Peter Surda) Windows 10, Windows Defender
+        # does not like this and fights with PyBitmessage
+        # over CPU, resulting in very slow PoW
+        # added on 2015-11-29: multiprocesing.freeze_support() doesn't help
+        try:
+            return _doFastPoW(target, initialHash)
+        except:
+            pass #fallback
     try:
         return _doFastPoW(target, initialHash)
     except: