patch 8.0.1409: buffer overflow in :tags command

Problem:    Buffer overflow in :tags command.
Solution:   Use vim_snprintf(). (Dominique Pelle, closes #2471, closes #2475)
            Add a test.
diff --git a/src/version.c b/src/version.c
index ed86ef6..97f0d66 100644
--- a/src/version.c
+++ b/src/version.c
@@ -772,6 +772,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1409,
+/**/
     1408,
 /**/
     1407,