small cleanup in src/compat .h and .cpp

- add license header
- fix include guards
- fix indentation

src/compat/glibcxx_sanity.cpp

@@ -1,5 +1,9 @@
-#include <locale>
+// Copyright (c) 2009-2014 The Bitcoin developers
+// Distributed under the MIT/X11 software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
 #include <list>
+#include <locale>
 #include <stdexcept>
 
 namespace{