patch 8.1.0287: MAX is not defined everywhere

Problem:    MAX is not defined everywhere.
Solution:   Define MAX where needed.

src/version.c

@@ -794,6 +794,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    287,
 /**/
     286,
 /**/