vim-patch:7.4.456

Problem:  'backupcopy' is global, cannot write only some
          files in a different way.
Solution: Make 'backupcopy' global-local. (Christian Brabandt)

https://code.google.com/p/vim/source/detail?r=v7-4-456

src/nvim/version.c

@@ -281,7 +281,7 @@ static int included_patches[] = {
   //459 NA
   //458,
   //457,
-  //456,
+  456,
   455,
   454,
   //453 NA