patch 8.1.1541: check for ASAN is not reliable

Problem:    Check for ASAN is not reliable.
Solution:   Check the version output. (Dominique Pelle, closes #4543)
diff --git a/src/version.c b/src/version.c
index 7e9cac3..abafa7e 100644
--- a/src/version.c
+++ b/src/version.c
@@ -778,6 +778,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1541,
+/**/
     1540,
 /**/
     1539,