patch 8.2.4647: "source" can read past end of copied line

Problem:    "source" can read past end of copied line.
Solution:   Add a terminating NUL.
diff --git a/src/version.c b/src/version.c
index 14fd1c3..b18de4c 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    4647,
+/**/
     4646,
 /**/
     4645,