Patch to workaround compile issues when using boost 1.59

ledger_boost_159.patch

diff --git a/src/system.hh.in b/src/system.hh.in
index 8de27ad..c6654cb 100644
--- a/src/system.hh.in
+++ b/src/system.hh.in
@@ -253,6 +253,17 @@ typedef std::ostream::pos_type ostream_pos_type;
 
 #include <boost/iterator/indirect_iterator.hpp>
 
+#if BOOST_VERSION == 105900
+// Fix for https://github.com/boostorg/python/issues/39
+namespace boost { namespace python {
+template <class D>
+inline object make_setter(D const& x)
+{
+    return detail::make_setter(x, default_call_policies(), is_member_pointer<D>(), 0);
+}
+}}
+#endif
+
 #endif // HAVE_BOOST_PYTHON
 
 #endif // _SYSTEM_HH