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/buffer_defs.h

@@ -596,6 +596,8 @@ struct file_buffer {
 
   int b_p_ai;                   /* 'autoindent' */
   int b_p_ai_nopaste;           /* b_p_ai saved for paste mode */
+  char_u      *b_p_bkc;         ///< 'backupcopy'
+  unsigned int b_bkc_flags;     ///< flags for 'backupcopy'
   int b_p_ci;                   /* 'copyindent' */
   int b_p_bin;                  /* 'binary' */
   int b_p_bomb;                 /* 'bomb' */