patch 8.0.1306: ASAN error stack trace is not useful

Problem:    ASAN error stack trace is not useful.
Solution:   Add "asan_symbolize". (James McCoy, closes #2344)
diff --git a/src/version.c b/src/version.c
index 1cffd61..c07635c 100644
--- a/src/version.c
+++ b/src/version.c
@@ -767,6 +767,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1306,
+/**/
     1305,
 /**/
     1304,