Portable: dont protect file after copying on Windows

portable.py

@@ -285,3 +285,8 @@ def prepare_editor_args(editor):
     args = editor.rsplit()
     shell = False
   return (args, shell)
+
+
+def os_chmod(dest, mode):
+  if isUnix():
+    os.chmod(dest, mode)

project.py

@@ -233,7 +233,8 @@ class _CopyFile(object):
         # make the file read-only
         mode = os.stat(dest)[stat.ST_MODE]
         mode = mode & ~(stat.S_IWUSR | stat.S_IWGRP | stat.S_IWOTH)
-        os.chmod(dest, mode)
+        # os.chmod(dest, mode)
+        portable.os_chmod(dest, mode)
       except IOError:
         _error('Cannot copy file %s to %s', src, dest)