small cleanup in src/compat .h and .cpp

- add license header
- fix include guards
- fix indentation

src/compat/sanity.h

@@ -1,7 +1,11 @@
+// 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.
+
 #ifndef BITCON_COMPAT_SANITY_H
 #define BITCON_COMPAT_SANITY_H
 
 bool glibc_sanity_test();
 bool glibcxx_sanity_test();
 
-#endif
+#endif // BITCON_COMPAT_SANITY_H