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.

include/boost/predef/compiler/visualc.h

@@ -80,6 +80,8 @@ Version number available as major, minor, and patch.
 
 #define BOOST_COMP_MSVC_NAME "Microsoft Visual C/C++"
 
+#endif
+
 #include <boost/predef/detail/test.h>
 BOOST_PREDEF_DECLARE_TEST(BOOST_COMP_MSVC,BOOST_COMP_MSVC_NAME)
 
@@ -87,6 +89,3 @@ BOOST_PREDEF_DECLARE_TEST(BOOST_COMP_MSVC,BOOST_COMP_MSVC_NAME)
 #include <boost/predef/detail/test.h>
 BOOST_PREDEF_DECLARE_TEST(BOOST_COMP_MSVC_EMULATED,BOOST_COMP_MSVC_NAME)
 #endif
-
-
-#endif