[6.0] 6f25ee3b8 Introduce a notice for past and future VSL records

[Dridi Boukelmoune]

commit 6f25ee3b8c0c17a9de6eb8f1dfded84fee513b17
Author: Dridi Boukelmoune <dridi.boukelmoune at gmail.com>
Date:   Thu Jul 4 11:51:26 2019 +0200

    Introduce a notice for past and future VSL records

diff --git a/include/tbl/vsl_tags.h b/include/tbl/vsl_tags.h
index 80e57eae4..b5cc017eb 100644
--- a/include/tbl/vsl_tags.h
+++ b/include/tbl/vsl_tags.h
@@ -47,6 +47,11 @@
 #define NODEF_NOTICE \
     "NB: This log record is masked by default.\n\n"
 
+#define NOSUP_NOTICE \
+    "\tNOTE: This tag is currently not in use in the Varnish log.\n" \
+    "\tIt is mentioned here to document legacy versions of the log,\n" \
+    "\tor reserved for possible use in future versions.\n\n"
+
 SLTM(Debug, SLT_F_UNSAFE, "Debug messages",
 	"Debug messages can normally be ignored, but are sometimes"
 	" helpful during trouble-shooting.  Most debug messages must"