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/cmd_list.cc
--- src/cmd_list.cc.orig
+++ src/cmd_list.cc
@@ -10,7 +10,6 @@
 
 #include "base.hh"
 #include <algorithm>
-#include "safe_map.hh"
 #include <utility>
 #include <iostream>
 #include <iterator>
@@ -18,6 +17,7 @@
 #include <boost/tuple/tuple.hpp>
 
 #include "basic_io.hh"
+#include "safe_map.hh"
 #include "cert.hh"
 #include "charset.hh"
 #include "cmd.hh"
