Add a comment after some #endif at end of apps source code.

Reviewed-by: Kurt Roeckx <kurt@openssl.org>
Reviewed-by: Rich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/1168)
diff --git a/apps/ts.c b/apps/ts.c
index ec83aac..80f14bd 100644
--- a/apps/ts.c
+++ b/apps/ts.c
@@ -978,4 +978,4 @@
 {
     return ok;
 }
-#endif
+#endif  /* ndef OPENSSL_NO_TS */