updated for version 7.3.677

Problem:    buf_spname() is used inconsistently.
Solution:   Make the return type a char_u pointer.  Check the size of the
            returned string.

src/version.c

@@ -719,6 +719,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    677,
 /**/
     676,
 /**/