patch 8.1.0287: MAX is not defined everywhere

Problem:    MAX is not defined everywhere.
Solution:   Define MAX where needed.
diff --git a/src/version.c b/src/version.c
index 23bcbf8..efc214c 100644
--- a/src/version.c
+++ b/src/version.c
@@ -795,6 +795,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    287,
+/**/
     286,
 /**/
     285,