Fix all header defines

src/protocol.h

@@ -7,8 +7,8 @@
 #error This header can only be compiled as C++.
 #endif
 
-#ifndef __INCLUDED_PROTOCOL_H__
-#define __INCLUDED_PROTOCOL_H__
+#ifndef BITCOIN_PROTOCOL_H
+#define BITCOIN_PROTOCOL_H
 
 #include "netbase.h"
 #include "serialize.h"
@@ -149,4 +149,4 @@ enum {
     MSG_FILTERED_BLOCK,
 };
 
-#endif // __INCLUDED_PROTOCOL_H__
+#endif // BITCOIN_PROTOCOL_H