Added a workaround for the missing MPL includes in Range.

This is a temporary workaround until Boost.Range is fixed by:

boostorg/range#154

Author: Lastique

test/range_distance_compat_test.cpp

@@ -4,6 +4,15 @@
 // (See accompanying file LICENSE_1_0.txt or copy at
 // http://www.boost.org/LICENSE_1_0.txt)
 
+// The following Boost.MPL includes are needed to mitigate the missing includes in Boost.Range.
+// They can be removed once https://github.com/boostorg/range/pull/154 is merged.
+// -- Begin workaround includes
+#include <boost/mpl/assert.hpp>
+#include <boost/mpl/eval_if.hpp>
+#include <boost/mpl/and.hpp>
+#include <boost/mpl/identity.hpp>
+// -- End of workaround includes
+
 #include <boost/range/distance.hpp>
 #include <boost/range/iterator_range_core.hpp>
 #include <boost/iterator/distance.hpp>