patch 8.1.2153: combining text property and syntax highlight is wrong

Problem:    Combining text property and syntax highlight is wrong. (Nick
            Jensen)
Solution:   Compute the syntax highlight attribute much earlier.
            (closes #5057)
diff --git a/src/version.c b/src/version.c
index e21f5c4..3392914 100644
--- a/src/version.c
+++ b/src/version.c
@@ -754,6 +754,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2153,
+/**/
     2152,
 /**/
     2151,