Build failed due to #define Float float in PATH_SDK

[vacary]

The compilation of BulletTimeStepping.cpp fails due a side effect between boost and PATH_SDK.

[81%] Building CXX object mechanics/CMakeFiles/mechanics.dir/src/contactDetection/bullet/BulletTimeStepping.cpp.o
In file included from /Users/acary/siconos/mechanics/src/contactDetection/bullet/BulletTimeStepping.cpp:48:
In file included from /Users/acary/siconos/kernel/src/modelingTools/NonSmoothDynamicalSystem.hpp:27:
In file included from /Users/acary/siconos/kernel/src/simulationTools/Topology.hpp:28:
In file included from /Users/acary/siconos/kernel/src/simulationTools/SimulationGraphs.hpp:27:
In file included from /Users/acary/siconos/kernel/src/utils/SiconosTools/SiconosGraph.hpp:56:
In file included from /opt/local/include/boost/graph/graph_utility.hpp:31:
In file included from /opt/local/include/boost/pending/container_traits.hpp:23:
In file included from /opt/local/include/boost/unordered_set.hpp:17:
In file included from /opt/local/include/boost/unordered/unordered_set.hpp:21:
In file included from /opt/local/include/boost/functional/hash.hpp:6:
In file included from /opt/local/include/boost/functional/hash/hash.hpp:21:
In file included from /opt/local/include/boost/functional/hash/detail/hash_float.hpp:14:
/opt/local/include/boost/functional/hash/detail/float_functions.hpp:78:28: error: expected a qualified name after 'typename'
template
^
/Users/acary/siconos/externals/PATH_SDK/include/Types.h:24:18: note: expanded from macro 'Float'

define Float float

             ^