Add endian.h header for byte order detection. Ensure that headers can be

included individually.

include/boost/predef/library/std.h

@@ -1,5 +1,5 @@
 /*
-Copyright Redshift Software, Inc. 2008-2012
+Copyright Redshift Software, Inc. 2008-2013
 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)
@@ -7,41 +7,17 @@ http://www.boost.org/LICENSE_1_0.txt)
 #ifndef BOOST_PREDEF_LIBRARY_STD_H
 #define BOOST_PREDEF_LIBRARY_STD_H
 
-/*
-We need to include an STD header to gives us the context
-of which library we are using. The "smallest" code-wise header
-seems to be <exception>. Boost uses <utility> but as far
-as I can tell (RR) it's not a standalone header in most
-implementations. Using <exception> also has the benefit of
-being available in EC++, so we get a chance to make this work
-for embedded users. And since it's not a header impacted by TR1
-there's no magic needed for inclusion in the face of the
-Boost.TR1 library.
-*/
-#include <boost/predef/detail/_exception.h>
+#include <boost/predef/library/std/_prefix.h>
 
-/*
-STLPort library; this _must_ come first, otherwise since
-STLport typically sits on top of some other library, we
-can end up detecting that first rather than STLport:
-*/
-#include <boost/predef/library/std/stlport.h>
-
-/*
-The rest in alpha order, except for Dinkumware.
-*/
 #include <boost/predef/library/std/cxx.h>
+#include <boost/predef/library/std/dinkumware.h>
 #include <boost/predef/library/std/libcomo.h>
 #include <boost/predef/library/std/modena.h>
 #include <boost/predef/library/std/msl.h>
 #include <boost/predef/library/std/roguewave.h>
 #include <boost/predef/library/std/sgi.h>
 #include <boost/predef/library/std/stdcpp3.h>
+#include <boost/predef/library/std/stlport.h>
 #include <boost/predef/library/std/vacpp.h>
 
-/*
-Dinkumware Library (this has to appear after any possible replacement libraries):
-*/
-#include <boost/predef/library/std/dinkumware.h>
-
 #endif