patch 8.2.1389: file missing from the distribution

Problem:    File missing from the distribution.
Solution:   Add script_util.vim to the list of distributes files.
diff --git a/src/version.c b/src/version.c
index c95d608..1ac4940 100644
--- a/src/version.c
+++ b/src/version.c
@@ -755,6 +755,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1389,
+/**/
     1388,
 /**/
     1387,