patch 8.0.1088: occasional memory use after free

Problem:    Occasional memory use after free.
Solution:   Use the highlight table directly, don't keep a pointer.
diff --git a/src/version.c b/src/version.c
index 12354ce..c86b7dc 100644
--- a/src/version.c
+++ b/src/version.c
@@ -770,6 +770,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1088,
+/**/
     1087,
 /**/
     1086,