vim-patch:7.4.2069

Problem:    spell.c is too big.
Solution:   Split it in spell file handling and spell checking.

9ccfebddc3

src/nvim/option.c

@@ -59,6 +59,7 @@
 #include "nvim/regexp.h"
 #include "nvim/screen.h"
 #include "nvim/spell.h"
+#include "nvim/spellfile.h"
 #include "nvim/strings.h"
 #include "nvim/syntax.h"
 #include "nvim/ui.h"