Merge pull request #5614 from Shougo/vim-7.4.2251

vim-patch:7.4.2251

src/nvim/buffer_defs.h

@@ -771,7 +771,7 @@ struct file_buffer {
 /*
  * Stuff for diff mode.
  */
-# define DB_COUNT 4     /* up to four buffers can be diff'ed */
+# define DB_COUNT 8     // up to four buffers can be diff'ed
 
 /*
  * Each diffblock defines where a block of lines starts in each of the buffers

src/nvim/version.c

@@ -191,7 +191,7 @@ static int included_patches[] = {
   // 2254 NA
   // 2253 NA
   // 2252 NA
-  // 2251,
+  2251,
   // 2250,
   // 2249,
   // 2248,