patch 8.0.0989: ActiveTcl dll name has changed in 8.6.6

Problem:    ActiveTcl dll name has changed in 8.6.6.
Solution:   Adjust the makefile. (Ken Takata)
diff --git a/src/version.c b/src/version.c
index 83cb3d9..9d4d431 100644
--- a/src/version.c
+++ b/src/version.c
@@ -770,6 +770,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    989,
+/**/
     988,
 /**/
     987,