Add missing include in apply_visitor_binary.hpp

[awulkiew]

For boost::is_lvalue_reference.

[awulkiew]

Currently boost/type_traits/is_lvalue_reference.hpp is included only in boost/variant/get.hpp and boost/variant/detail/multivisitors_cpp11_based.hpp. In case when neither of these files is included the compilation fails:

In file included from ../libs/geometry/test/algorithms/convert.cpp:16:
In file included from ../libs/geometry/test/algorithms/test_convert.hpp:13:
In file included from ../boost/geometry/algorithms/assign.hpp:28:
In file included from ../boost/variant/apply_visitor.hpp:17:
../boost/variant/detail/apply_visitor_binary.hpp:137:26: error: no member named 'is_lvalue_reference' in namespace 'boost'
        , ! ::boost::is_lvalue_reference<Value1>::value
            ~~~~~~~~~^

from

http://www.boost.org/development/tests/develop/developer/output/teeks99-02-dc3-0-11-Docker-64on64-boost-bin-v2-libs-geometry-test-algorithms-algorithms_convert-test-clang-gnu-linux-3-0~c++11-debug-threadapi-pthread.html

[awulkiew]

This is also a problem in master and boost-1.66.0 Beta1 RC1.