patch 8.0.0839: cannot kill a job in a terminal with CTRL-C

Problem:    Cannot kill a job in a terminal with CTRL-C.
Solution:   Set the controlling tty and send SIGINT. (closes #1910)
diff --git a/src/version.c b/src/version.c
index 25c39f1..1922837 100644
--- a/src/version.c
+++ b/src/version.c
@@ -770,6 +770,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    839,
+/**/
     838,
 /**/
     837,