patch 8.2.3449: sort fails if the sort compare function returns 999

Problem:    Sort fails if the sort compare function returns 999.
Solution:   Adjust value to -1 / 0 / 1. (Yasuhiro Matsumoto, closes #8884)
diff --git a/src/version.c b/src/version.c
index 38f9017..99a94e2 100644
--- a/src/version.c
+++ b/src/version.c
@@ -758,6 +758,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    3449,
+/**/
     3448,
 /**/
     3447,