patch 8.1.0605: running make in the top directory echoes a comment

Problem:    Running make in the top directory echoes a comment.
Solution:   Prefix with @. (closes #3698)
diff --git a/src/version.c b/src/version.c
index 10361cb..3369480 100644
--- a/src/version.c
+++ b/src/version.c
@@ -800,6 +800,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    605,
+/**/
     604,
 /**/
     603,