Fix non-standard test feature test collection. I.e. make the feature

collection no rely on implementioned defined behaviour. And fix check
program handling of no-expression invocations vs expression invocations.

check/predef_check_as_cpp.cpp

@@ -1 +1,7 @@
-#include "predef_check_as_c.c"
+/*
+Copyright Rene Rivera 2011-2015
+Distributed under the Boost Software License, Version 1.0.
+(See accompanying file LICENSE_1_0.txt or copy at
+http://www.boost.org/LICENSE_1_0.txt)
+*/
+#include "predef_check.h"