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/transforms.cc
--- src/transforms.cc.orig
+++ src/transforms.cc
@@ -12,11 +12,11 @@
 #include <botan/botan.h>
 #include <botan/sha160.h>
 
-#include "botan_pipe_cache.hh"
-#include "gzip.hh"
-
 #include "transforms.hh"
 #include "char_classifiers.hh"
+
+#include "botan_pipe_cache.hh"
+#include "gzip.hh"
 
 using std::string;
 using Botan::Pipe;