patch 8.1.1613: popup window test fails with Athena and Motif

Problem:    Popup window test fails with Athena and Motif.
Solution:   Compute the highlight attribut when the GUI is not active.
diff --git a/src/version.c b/src/version.c
index 7bd2327..2ba2bca 100644
--- a/src/version.c
+++ b/src/version.c
@@ -778,6 +778,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1613,
+/**/
     1612,
 /**/
     1611,