core: fix warning with recent Boost version

src/multibody/data.hxx

 //
-// Copyright (c) 2015-2019 CNRS INRIA
+// Copyright (c) 2015-2020 CNRS INRIA
 // Copyright (c) 2015 Wandercraft, 86 rue de Paris 91400 Orsay, France.
 //
 
@@ -11,9 +11,6 @@
 #include "pinocchio/utils/string-generator.hpp"
 #include "pinocchio/multibody/liegroup/liegroup-algo.hpp"
 
-#include <boost/bind.hpp>
-#include <boost/utility.hpp>
-
 /// @cond DEV
 
 namespace pinocchio

src/multibody/geometry.hxx

@@ -7,6 +7,9 @@
 
 #include "pinocchio/multibody/model.hpp"
 
+#include <boost/bind/bind.hpp>
+#include <boost/utility.hpp>
+
 /// @cond DEV
 
 namespace pinocchio
@@ -94,7 +97,7 @@ namespace pinocchio
 
   inline GeomIndex GeometryModel::getGeometryId(const std::string & name) const
   {
-
+    using namespace boost::placeholders;
     GeometryObjectVector::const_iterator it
     = std::find_if(geometryObjects.begin(),
                    geometryObjects.end(),
@@ -105,6 +108,7 @@ namespace pinocchio
 
   inline bool GeometryModel::existGeometryName(const std::string & name) const
   {
+    using namespace boost::placeholders;
     return std::find_if(geometryObjects.begin(),
                         geometryObjects.end(),
                         boost::bind(&GeometryObject::name, _1) == name) != geometryObjects.end();

src/multibody/model.hxx

@@ -10,9 +10,6 @@
 #include "pinocchio/utils/string-generator.hpp"
 #include "pinocchio/multibody/liegroup/liegroup-algo.hpp"
 
-#include <boost/bind.hpp>
-#include <boost/utility.hpp>
-
 /// @cond DEV
 
 namespace pinocchio