A function macro named E clashes with internal boost definitions.  Rearrange
the order of header inclusion so that affected boost headers are included
before monotone defines the macro.

Also, stop bundling boost/circular_buffer, which is available in current
versions of boost. From Fedora.

Index: src/netcmd.hh
--- src/netcmd.hh.orig
+++ src/netcmd.hh
@@ -10,13 +10,13 @@
 #ifndef __NETCMD_HH__
 #define __NETCMD_HH__
 
-#include "vector.hh"
 #include <list>
 #include <utility>
 #include <iostream>
 
-#include "globish.hh"
 #include "merkle_tree.hh"
+#include "vector.hh"
+#include "globish.hh"
 #include "numeric_vocab.hh"
 #include "uri.hh"
 #include "vocab.hh"