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/rcs_file.cc
--- src/rcs_file.cc.orig
+++ src/rcs_file.cc
@@ -10,7 +10,6 @@
 
 #include "base.hh"
 #include <fstream>
-#include "vector.hh"
 
 #ifdef WIN32
 #include <windows.h>
@@ -32,6 +31,7 @@
 #endif
 
 #include "rcs_file.hh"
+#include "vector.hh"
 #include "sanity.hh"
 #include "char_classifiers.hh"