Move proto version to version.h. Reduce header deps a bit more.

src/addrman.h

@@ -6,6 +6,7 @@
 
 #include "netbase.h"
 #include "protocol.h"
+#include "util.h"
 
 
 #include <map>

src/protocol.h

@@ -12,7 +12,6 @@
 
 #include "serialize.h"
 #include "netbase.h"
-#include "util.h"
 #include <string>
 #include "uint256.h"
 

src/uint256.h

@@ -5,12 +5,13 @@
 #ifndef BITCOIN_UINT256_H
 #define BITCOIN_UINT256_H
 
-#include "serialize.h"
-
 #include <limits.h>
+#include <string.h>
 #include <string>
 #include <vector>
 
+#include "version.h"
+
 typedef long long  int64;
 typedef unsigned long long  uint64;