vim-patch: mark 7.4.660 as included

refs #2138

vim-patch: https://code.google.com/p/vim/source/detail?r=476a12a96bb1e5ccc71b1c1010d529deca271617

src/nvim/version.c

@@ -178,6 +178,10 @@ static char *(features[]) = {
 
 // clang-format off
 static int included_patches[] = {
+  //662,
+  //661,
+  660,
+  //659,
   //658,
   //657,
   //656,