[test][buffer] Add missing include

Author: awulkiew

test/algorithms/buffer/buffer_with_strategies.cpp

@@ -2,6 +2,7 @@
 // Unit Test
 
 // Copyright (c) 2015-2019 Barend Gehrels, Amsterdam, the Netherlands.
+// Copyright (c) 2022 Adam Wulkiewicz, Lodz, Poland.
 
 // Use, modification and distribution is subject to the Boost Software License,
 // Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
@@ -19,6 +20,7 @@
 #include <boost/geometry/algorithms/area.hpp>
 #include <boost/geometry/algorithms/correct.hpp>
 #include <boost/geometry/algorithms/num_points.hpp>
+#include <boost/geometry/io/wkt/read.hpp>
 
 
 // This unit test tests boost::geometry::buffer (overload with strategies)