patch 7.4.2251

Problem:    In rare cases diffing 4 buffers is not enough.
Solution:   Raise the limit to 8. (closes #1000)

src/version.c

@@ -763,6 +763,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    2251,
 /**/
     2250,
 /**/